CN217206307U

CN217206307U - Tunnel culvert stake well rotary drill aircraft nose structure

Info

Publication number: CN217206307U
Application number: CN202220870159.9U
Authority: CN
Inventors: 李红飞
Original assignee: Chengdu Jingfeihong Technology Co ltd
Current assignee: Chengdu Jingfeihong Technology Co ltd
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2022-08-16
Anticipated expiration: 2032-04-15

Abstract

The utility model discloses a rotary drilling machine head structure for a tunnel culvert pile well, which comprises a fixed base, wherein folding telescopic arms are symmetrically hinged on two sides of the fixed base, and a folding arm driving and extending device is arranged between the folding telescopic arms and the fixed base; a slide rail assembly is arranged at the free end of the folding telescopic arm in a linear sliding manner, and a slide rail driving device for driving the slide rail assembly to slide linearly is arranged between one side of the slide rail assembly and the free end of the folding telescopic arm; a drilling device is arranged on the sliding rail assembly in a sliding mode, and a drill bit moving device which drives the drilling device to linearly move along the sliding rail assembly is arranged between the drilling device and the sliding rail assembly; the utility model discloses compatible stake well drilling operation is carried out in the region that can adapt to different areas, can effectively keep the steadiness of drill bit simultaneously in drilling process, and then guarantees final drilling quality.

Description

Tunnel culvert stake well rotary drill aircraft nose structure

Technical Field

The utility model belongs to the technical field of drilling of culvert stake well, concretely relates to tunnel culvert stake well rotary drill aircraft nose structure.

Background

When carrying out tunnel culvert pier construction, in order to guarantee the steadiness of pier, need be executed at the pier bottom and do the stake well to the pier stake of being under construction in the stake well is in order to consolidate the pier. In order to construct a pier pile, a pile hole needs to be drilled in a working surface of a pile well. The traditional pile hole is drilled at the bottom of the pile bottom by a manual hand-held drilling machine. Not only inefficiency is difficult to guarantee drilling equipment's stability moreover, and then leads to the system hole unqualified. In the prior art, pile holes are prepared through automatic drilling equipment such as a drilling machine, but the problem that the stability of a drill bit is difficult to guarantee in the drilling process also exists. And the drilling area of the existing automatic drilling equipment is relatively fixed, and when the drilling equipment is used for drilling on a large surface, the position of the drilling equipment needs to be frequently moved, so that the construction efficiency is also reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rotatory rig aircraft nose structure of tunnel culvert stake well can carry out high-efficient stable stake well drilling operation to the construction region of different areas.

The utility model discloses a following technical scheme realizes:

a rotary drilling machine head structure for a tunnel culvert pile well comprises a fixed base, wherein folding telescopic arms are symmetrically hinged to two sides of the fixed base, and a folding arm driving stretching device is arranged between each folding telescopic arm and the fixed base; a slide rail assembly is arranged at the free end of the folding telescopic arm in a linear sliding manner, and a slide rail driving device for driving the slide rail assembly to slide linearly is arranged between one side of the slide rail assembly and the free end of the folding telescopic arm; the drilling device is arranged on the sliding rail assembly in a sliding mode, and a drill bit moving device which drives the drilling device to move linearly along the sliding rail assembly is arranged between the drilling device and the sliding rail assembly.

The folding telescopic arm is of a connecting rod structure, and the folding arm driving stretching device drives the folding telescopic arm to unfold or fold. The folding telescopic boom is unfolded towards the working surface to be drilled, so that the free end of the folding telescopic boom is close to the working surface. Then, the slide rail driving device drives the slide rail assembly to linearly slide close to the working surface along the free end of the folding telescopic arm, so that the free end of the slide rail assembly is abutted to the working surface, and the slide rail assembly is positioned and fixed by the working surface. Then drive drilling equipment through drill bit mobile device and slide along the direction that the slide rail assembly orientation is close to the working face until drill bit assembly and working face contact, then can start drill bit assembly and carry out the drilling operation of stake wellhole on the working face. In the drilling process, the sliding rail assembly is always in contact with the working face in an abutting mode, and therefore the working stability of the drill bit assembly can be effectively guaranteed. Simultaneously through the expansion angle of the folding flexible arm of control, can satisfy the demand that different positions carry out the drilling operation on the working face, the suitability is more extensive.

In order to better realize the utility model, furthermore, the slide rail component comprises a jacking slide rail and a supporting slide rail which are arranged in parallel, the length of the jacking slide rail is less than that of the supporting slide rail, the jacking slide rail is in linear sliding connection with the free end of the folding telescopic arm, and a slide rail driving device which drives the jacking slide rail to linearly slide is arranged between the jacking slide rail and the free end of the folding telescopic arm; the drilling device is characterized in that the drilling device is sleeved on the support slide rail in a sliding mode, and a drill bit moving device which drives the drilling device to move linearly along the support slide rail is arranged between the support slide rail and the drilling device.

The length of supporting the slide rail is greater than the length of the tight slide rail in top, supports the well head terminal surface counterbalance contact of slide rail and stake well, and then realizes fixing the location of whole slide rail set spare. At the moment, the supporting slide rail extends to the inside of the pile well, and then the drill bit assembly is driven to be close to the drilling surface of the pile well by the operation of installation to carry out hole making operation.

For better realization the utility model discloses, furtherly, slide rail drive arrangement includes slide rail drive hydro-cylinder, slide rail installation cover, parallel mount has the tight slide rail in top and supports the slide rail on the slide rail installation cover, slide rail drive hydro-cylinder's telescopic link is articulated with one side of slide rail installation cover, slide rail drive hydro-cylinder's the cylinder body is articulated with the free end of folding flexible arm.

Through the flexible of slide rail drive hydro-cylinder, and then drive slide rail installation cover and carry out relative linear sliding between the tight slide rail in top, and then drive the tight slide rail in top and be close to or keep away from the well head terminal surface of stake well.

In order to better realize the utility model, the drill bit moving device further comprises a moving sleeve, a moving motor, a gear and a rack, the moving sleeve is sleeved on the supporting slide rail in a sliding way, and a drilling device is arranged on the moving sleeve; one side of the supporting slide rail is provided with a rack, the moving motor is arranged on the moving sleeve, and a gear meshed with the rack is sleeved on an output shaft of the moving motor.

In order to better realize the utility model discloses, furtherly, drilling equipment includes adapter, drill bit driving motor, drill bit, the adapter is connected with drill bit mobile device's removal portion, it is provided with the drill bit to rotate on the adapter, the one end and the output shaft transmission of drill bit driving motor of drill bit are connected.

In order to better realize the utility model discloses, furtherly, folding flexible arm includes first support arm of mutual articulated and second support arm, the one end that the second support arm was kept away from to first support arm is articulated with fixed baseplate, the one end and the sliding connection of sliding rail set spare of first support arm are kept away from to the second support arm.

In order to better realize the utility model, furthermore, a first balance supporting rod and a second balance supporting rod are respectively arranged at two sides of the first supporting arm, one end of the first balance supporting rod is hinged with the fixed base, and the other end of the first balance supporting rod is hinged with one side of the first supporting arm; one end of the second balance supporting rod is hinged with the fixed base, and the other end of the second balance supporting rod is hinged with the other side of the first supporting arm.

In order to better realize the utility model discloses, furtherly, one side of second support arm is provided with third balanced branch, the one end of third balanced branch is articulated with the one end of second support arm, and the other end of third balanced branch is articulated with the other end linkage of second balanced branch.

In order to better realize the utility model discloses, furtherly, be provided with the slip cap on the free end of second support arm, slip cap and sliding rail set spare sliding connection.

In order to better realize the utility model discloses, furtherly, folding arm drive extends the device and extends the hydro-cylinder including folding arm, folding arm extends the cylinder body and the fixed baseplate of hydro-cylinder articulated, folding arm extends the telescopic link of hydro-cylinder and one side of first support arm is articulated.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

(1) the utility model discloses a set up folding flexible arm at fixed baseplate's both sides symmetry, and drive the folding flexible arm of both sides to expand or draw in step through folding arm drive extension fixture, and then drive the drilling equipment on the free end of folding flexible arm and expand or fold in step, and then satisfy the compatible drilling operation of the working area of different areas, avoided the trivial movement of whole equipment, and then effectively improved stake well drilling efficiency;

(2) the utility model discloses a slide rail set up at the free end linear sliding of folding flexible arm, when carrying out the drilling operation of pile well, drive slide rail set spare through slide rail drive arrangement and be close to the pile well for some slide rail set spares the contact with the footpath mouth terminal surface of pile well, and another part slide rail set spare extends to in the pile well, effectively guarantees the steadiness of whole slide rail set spare in the drilling process, and then guarantees the steadiness of drilling equipment, in order to guarantee final drilling quality;

(3) the utility model discloses a linear sliding sets up drilling equipment on slide rail set spare to drive drilling equipment through drill bit mobile device and be close to the working face removal of stake well, and then drive the drill bit and can swiftly be close to the working face in order to carry out high-efficient automatic drilling operation, improved stake well drilling efficiency greatly.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

fig. 2 is a front view of the present invention;

fig. 3 is a top view of the present invention;

FIG. 4 is a schematic view of the installation of the slide rail assembly and the slide rail driving device;

FIG. 5 is a schematic view of the installation of the drilling apparatus and the bit moving apparatus;

fig. 6 is a schematic structural view of the folding telescopic arm.

Wherein: 1-a fixed base; 2-folding the telescopic arm; 3-folding arm drive extension means; 4-a slide rail assembly; 5-a slide rail driving device; 6-drilling equipment; 7-a drill bit moving device; 21-a first arm; 22-a second support arm; 31-folding arm extension oil cylinder; 41-tightly pushing the sliding rail; 42-support slide rail; 51-a slide rail driving oil cylinder; 52-slide rail mounting sleeve; 61-an adapter; 62-a drill drive motor; 63-a drill bit; 71-moving the sleeve; 72-moving the motor; 001-a first balance strut; 002-a second balance strut; 003-third balance strut.

Detailed Description

Example 1:

the machine head structure of the rotary drilling machine for the tunnel culvert pile well in the embodiment is shown in fig. 1-3, and comprises a fixed base 1, wherein folding telescopic arms 2 are symmetrically hinged to two sides of the fixed base 1, and a folding arm driving and extending device 3 is arranged between the folding telescopic arms 2 and the fixed base 1; a slide rail component 4 is linearly and slidably arranged at the free end of the folding telescopic arm 2, and a slide rail driving device 5 for driving the slide rail component 4 to linearly slide is arranged between one side of the slide rail component 4 and the free end of the folding telescopic arm 2; sliding on the slide rail assembly 4 and being provided with drilling equipment 6, be provided with drill bit mobile device 7 that drives drilling equipment 6 along slide rail assembly 4 linear motion between drilling equipment 6 and the slide rail assembly 4.

At least one group of folding telescopic arms 2 are symmetrically arranged on two sides of the fixed base 1, and the folding telescopic arms 2 are of mutually hinged connecting rod structures. Through the swing of folding arm drive stretching device 3 drive connecting rod structure, and then realize driving the folding flexible arm 2 of both sides and expand or fold towards the direction of being close to fixed baseplate 1 towards the direction of keeping away from fixed baseplate 1, and then can be applicable to the drilling operation in the drilling region of different area sizes. The end of the folding telescopic arm 2, which is not hinged to the fixed base 1, is a free end, a slide rail assembly 4 is arranged on the free end in a linear sliding mode along the direction towards the pile well, the slide rail assembly 4 and the free end of the folding telescopic arm 2 are driven to move linearly relative to each other through a slide rail driving device 5, and then the slide rail assembly 4 is driven to be close to the pile well. And the free end of the sliding rail assembly 4 is contacted with the end face of the well mouth of the pile well, so that the whole sliding rail assembly 4 is positioned and fixed.

The drilling device 6 is then moved by the drill bit moving device 7 along the slide assembly 4 towards the inside of the pile shaft until the drilling device 6 contacts the working surface at the bottom of the pile shaft, and drilling operation can then be performed on the working surface by the drilling device 6. Compare in traditional artifical drilling pile wellhole, adopt this device can high-efficient safety to carry out pile well drilling operation, can effectively guarantee the steadiness of drilling equipment 6 in the well drilling process simultaneously.

Example 2:

in this embodiment, further optimization is performed on the basis of embodiment 1, as shown in fig. 1 and fig. 4, the slide rail assembly 4 includes a tightening slide rail 41 and a supporting slide rail 42 which are arranged in parallel, the length of the tightening slide rail 41 is smaller than that of the supporting slide rail 42, the tightening slide rail 41 is linearly slidably connected with the free end of the folding telescopic arm 2, and a slide rail driving device 5 for driving the tightening slide rail 41 to linearly slide is arranged between the tightening slide rail 41 and the free end of the folding telescopic arm 2; the support slide rail 42 is provided with a drilling device 6 in a sliding manner, and a drill bit moving device 7 for driving the drilling device 6 to linearly move along the support slide rail 42 is arranged between the support slide rail 42 and the drilling device 6.

The jacking slide rail 41 and the supporting slide rail 42 are arranged in parallel, the jacking slide rail 41 is driven to move towards the pile well through the slide rail driving device 5, the free end of the jacking slide rail 41 is abutted to the end face of the wellhead of the pile well, and the supporting slide rail 42 just extends to the inner part of the pile well at the moment. The stability of the supporting slide rail 42 is ensured by the positioning and fixing of the abutting slide rail 41. Then the drilling device 6 is driven by the drill bit moving device 7 to slide along the supporting slide rail 42 to the inner part of the pile well, and the smooth drilling operation can be started until the drilling device 6 is contacted with the working surface at the bottom of the pile well.

Further, be provided with the shock-absorbing cushion layer on the contact end of the well head terminal surface of tight slide rail 41 in top and stake well, can effectively cushion the vibrations that support slide rail 42 transmission in the drilling through the shock-absorbing cushion layer, further promote the stationarity of drilling operation.

Other parts of this embodiment are the same as embodiment 1, and thus are not described again.

Example 3:

the embodiment is further optimized on the basis of the

above embodiment

1 or 2, as shown in fig. 1 and fig. 4, the slide rail driving device 5 includes a slide rail driving cylinder 51 and a slide rail mounting sleeve 52, a jacking slide rail 41 and a supporting slide rail 42 are mounted on the slide rail mounting sleeve 52 in parallel, a telescopic rod of the slide rail driving cylinder 51 is hinged to one side of the slide rail mounting sleeve 52, and a cylinder body of the slide rail driving cylinder 51 is hinged to a free end of the folding telescopic arm 2.

The slide rail mounting sleeve 52 is provided with two mounting holes for tightly supporting the slide rail 41 and the support slide rail 42, the side surface of the slide rail mounting sleeve 52 is hinged with the telescopic rod of the slide rail driving oil cylinder 51 through a hinge shaft, and the support lug of the cylinder body of the slide rail driving oil cylinder 51 is hinged with the free end of the folding telescopic arm 2 through the hinge shaft. The telescopic rod of the sliding rail driving oil cylinder 51 stretches out and draws back, so that the jacking sliding rail 41 and the free end of the folding telescopic arm 2 are driven to perform relative linear movement, and the supporting sliding rail 42 is driven to be close to or far away from the pile well.

Meanwhile, when drilling operation is carried out, the free end of the jacking sliding rail 41 is abutted to the end face of the well mouth of the pile well, meanwhile, the sliding rail driving oil cylinder 51 is self-locked, and then the relative position between the jacking sliding rail 41 and the free end of the folding telescopic arm 2 is fixed, so that the stability of the drilling operation is further ensured.

The rest of this embodiment is the same as

embodiment

1 or 2, and therefore, the description thereof is omitted.

Example 4:

the present embodiment is further optimized on the basis of any one of the above embodiments 1 to 3, as shown in fig. 1 and 5, the drill moving device 7 includes a moving sleeve 71, a moving motor 72, a gear, and a rack, the moving sleeve 71 is slidably sleeved on the supporting slide rail 42, and the moving sleeve 71 is provided with a drilling device 6; a rack is arranged on one side of the support slide rail 42, the moving motor 72 is installed on the moving sleeve 71, and a gear meshed with the rack is sleeved on an output shaft of the moving motor 72.

The moving motor 72 drives the gear to rotate, and then the gear and the rack are meshed to drive the moving sleeve 71 to linearly slide along the supporting slide rail 42, so as to drive the drilling device 6 to linearly approach or leave the pile well. Meanwhile, the linear movement of the drilling device 6 is guided by the sliding fit between the moving sleeve 71 and the supporting slide rail 42.

Other parts of this embodiment are the same as any of embodiments 1 to 3, and thus are not described again.

Example 5:

the present embodiment is further optimized on the basis of any one of the above embodiments 1 to 4, as shown in fig. 1 and 5, the drilling device 6 includes an adapter 61, a drill driving motor 62, and a drill 63, the adapter 61 is connected to the moving portion of the drill moving device 7, the drill 63 is rotatably disposed on the adapter 61, and one end of the drill 63 is in transmission connection with an output shaft of the drill driving motor 62.

The adapter 61 is connected with one side of the movable sleeve 71, and the adapter 61 is driven to linearly move by the linear sliding of the movable sleeve 71, so that the drill 63 is driven to linearly move. Meanwhile, one end of the drill bit 63 is connected with an output shaft of the drill bit driving motor 62 through a rotating shaft, and the drill bit 63 is driven to rotate through the drill bit driving motor 62, so that the drilling operation is realized.

Other parts of this embodiment are the same as any of embodiments 1 to 4, and thus are not described again.

Example 6:

the present embodiment is further optimized based on any one of the above embodiments 1 to 5, as shown in fig. 6, the folding telescopic boom 2 includes a first boom 21 and a second boom 22 hinged to each other, an end of the first boom 21 away from the second boom 22 is hinged to the fixed base 1, and an end of the second boom 22 away from the first boom 21 is slidably connected to the slide rail assembly 4.

The first support arm 21 and the second support arm 22 are hinged to form a link structure, the free end of the first support arm 21 is hinged to the fixed base 1 through a hinge shaft, and the free end of the second support arm 22 is slidably connected with the tightening slide rail 41 through a moving sleeve 71. The folding arm driving and extending device 3 drives the first support arm 21 to swing around the hinge with the fixed base 1, and further drives the second support arm 22 to swing so as to drive the slide rail assembly 4 to move.

Other parts of this embodiment are the same as any of embodiments 1 to 5, and thus are not described again.

Example 7:

this embodiment is further optimized on the basis of any of the above embodiments 1-6, as shown in fig. 6, a first balance supporting rod 001 and a second balance supporting rod 002 are respectively disposed on two sides of the first supporting arm 21, one end of the first balance supporting rod 001 is hinged to the fixed base 1, and the other end of the first balance supporting rod 001 is hinged to one side of the first supporting arm 21; one end of the second balance supporting rod 002 is hinged with the fixed base 1, and the other end of the second balance supporting rod 002 is hinged with the other side of the first supporting arm 21.

When folding arm drive extension device 3 drives first support arm 21 and swings, under the traction of first support arm 21 for first balanced branch 001 and the synchronous swing of second balanced branch 002, the cooperation through first balanced branch 001 and second balanced branch 002 makes the swing of first support arm 21 more steady.

One side of the second support arm 22 is provided with a third balance support rod 003, one end of the third balance support rod 003 is hinged with one end of the second support arm 22, and the other end of the third balance support rod 003 is hinged with the other end of the second balance support rod 002 in a linkage manner.

Furthermore, a sliding sleeve is arranged at the free end of the second support arm 22, and the sliding sleeve is slidably connected with the sliding rail assembly 4.

When the second support arm 22 swings, the third balance supporting rod 003 is pulled synchronously to swing, and the swing of the second support arm 22 is more stable through the auxiliary support of the third balance supporting rod 003.

Other parts of this embodiment are the same as any of embodiments 1 to 6, and thus are not described again.

Example 8:

this embodiment is further optimized on the basis of any one of the above embodiments 1 to 7, and as shown in fig. 6, the folding arm driving and extending device 3 includes a folding arm extending cylinder 31, a cylinder body of the folding arm extending cylinder 31 is hinged to the fixed base 1, and an expansion rod of the folding arm extending cylinder 31 is hinged to one side of the first support arm 21.

The end of the telescopic rod of the folding arm stretching oil cylinder 31 is hinged with one side of the first support arm 21 through a connecting support lug, and the end of the cylinder body of the folding arm stretching oil cylinder 31 is hinged with one side of the fixed base 1 through a hinge shaft. The telescopic rod of the folding arm stretching oil cylinder 31 stretches and retracts, so that the first support arm 21 is driven to swing around the hinged position between the first support arm and the fixed base 1.

Other parts of this embodiment are the same as any of embodiments 1 to 7, and thus are not described again.

The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.

Claims

1. A rotary drilling machine head structure for a tunnel culvert pile well comprises a fixed base (1), and is characterized in that folding telescopic arms (2) are symmetrically hinged to two sides of the fixed base (1), and a folding arm driving and extending device (3) is arranged between each folding telescopic arm (2) and the fixed base (1); a slide rail component (4) is arranged at the free end of the folding telescopic arm (2) in a linear sliding manner, and a slide rail driving device (5) for driving the slide rail component (4) to slide linearly is arranged between one side of the slide rail component (4) and the free end of the folding telescopic arm (2); the drilling device is characterized in that a drilling device (6) is arranged on the sliding rail assembly (4) in a sliding mode, and a drill bit moving device (7) which drives the drilling device (6) to move linearly along the sliding rail assembly (4) is arranged between the drilling device (6) and the sliding rail assembly (4).

2. The rotary drilling machine head structure for the tunnel culvert pile well according to claim 1, wherein the slide rail assembly (4) comprises a jacking slide rail (41) and a supporting slide rail (42) which are arranged in parallel, the length of the jacking slide rail (41) is smaller than that of the supporting slide rail (42), the jacking slide rail (41) is in linear sliding connection with the free end of the folding telescopic arm (2), and a slide rail driving device (5) for driving the jacking slide rail (41) to slide linearly is arranged between the jacking slide rail (41) and the free end of the folding telescopic arm (2); the drilling device is characterized in that a drilling device (6) is sleeved on the support sliding rail (42) in a sliding mode, and a drill bit moving device (7) which drives the drilling device (6) to move linearly along the support sliding rail (42) is arranged between the support sliding rail (42) and the drilling device (6).

3. The rotary drilling machine head structure for the tunnel culvert pile well according to claim 2, characterized in that the slide rail driving device (5) comprises a slide rail driving oil cylinder (51) and a slide rail mounting sleeve (52), wherein a jacking slide rail (41) and a supporting slide rail (42) are mounted on the slide rail mounting sleeve (52) in parallel, a telescopic rod of the slide rail driving oil cylinder (51) is hinged with one side of the slide rail mounting sleeve (52), and a cylinder body of the slide rail driving oil cylinder (51) is hinged with a free end of the folding telescopic arm (2).

4. The rotary drilling machine head structure for the tunnel culvert pile well according to claim 2, characterized in that the drill bit moving device (7) comprises a moving sleeve (71), a moving motor (72), a gear and a rack, the moving sleeve (71) is slidably sleeved on the supporting slide rail (42), and the drilling device (6) is arranged on the moving sleeve (71); a rack is arranged on one side of the supporting sliding rail (42), the moving motor (72) is installed on the moving sleeve (71), and a gear meshed with the rack is sleeved on an output shaft of the moving motor (72).

5. The rotary drilling machine head structure for the tunnel culvert pile well according to claim 4, characterized in that the drilling device (6) comprises an adapter (61), a drill bit driving motor (62) and a drill bit (63), the adapter (61) is connected with a moving part of the drill bit moving device (7), the drill bit (63) is rotatably arranged on the adapter (61), and one end of the drill bit (63) is in transmission connection with an output shaft of the drill bit driving motor (62).

6. A rotary drilling machine head structure for tunnel culvert pile wells according to any one of claims 1-5, characterized in that the folding telescopic arm (2) comprises a first arm (21) and a second arm (22) which are hinged with each other, the end of the first arm (21) far away from the second arm (22) is hinged with the fixed base (1), and the end of the second arm (22) far away from the first arm (21) is connected with the sliding rail component (4) in a sliding way.

7. The rotary drilling machine head structure for the tunnel culvert pile well according to claim 6, wherein a first balance supporting rod (001) and a second balance supporting rod (002) are respectively arranged on two sides of the first supporting arm (21), one end of the first balance supporting rod (001) is hinged with the fixed base (1), and the other end of the first balance supporting rod (001) is hinged with one side of the first supporting arm (21); one end of the second balance supporting rod (002) is hinged with the fixed base (1), and the other end of the second balance supporting rod (002) is hinged with the other side of the first supporting arm (21).

8. The rotary drilling machine head structure for the tunnel culvert pile well according to claim 7, characterized in that a third balance supporting rod (003) is arranged at one side of the second supporting arm (22), one end of the third balance supporting rod (003) is hinged with one end of the second supporting arm (22), and the other end of the third balance supporting rod (003) is hinged with the other end of the second balance supporting rod (002) in a linkage manner.

9. The rotary drilling machine head structure for the tunnel culvert pile well according to claim 6, characterized in that the free end of the second support arm (22) is provided with a sliding sleeve, and the sliding sleeve is connected with the sliding rail component (4) in a sliding manner.

10. The rotary drilling machine head structure for the tunnel culvert pile well according to claim 6, characterized in that the folding arm driving and extending device (3) comprises a folding arm extending oil cylinder (31), the body of the folding arm extending oil cylinder (31) is hinged with the fixed base (1), and the telescopic rod of the folding arm extending oil cylinder (31) is hinged with one side of the first support arm (21).