Milling and digging head for full-section ditching

Abstract

The invention relates to the technical field of milling and digging heads for ditching, in particular to a milling and digging head for full-section ditching, which comprises a tool bit and an upper plate, and a first side plate and a second side plate are fixedly mounted at positions, close to two sides, of the bottom of the upper plate respectively. A first inclined plate and a second inclined plate are fixedly installed at the bottom of the first side plate and the bottom of the second side plate correspondingly, the first inclined plate and the second inclined plate are in the state of gradually inclining inwards from top to bottom, rotating pipes are rotatably installed on the outer side of the first inclined plate and the outer side of the second inclined plate correspondingly, and the two rotating pipes are in a V shape; the tool bit is installed on the outer surface of the rotating pipe, and a motor is fixedly installed on the outer side of the second side plate. The device has the beneficial effects that the two rotating pipes are arranged to be of a V-shaped structure, the tool bits are installed on the outer surfaces of the rotating pipes, it can be guaranteed that the middle position of the device can be dug when the device works, and the ditching quality is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of trenching milling heads, specifically to a full-section trenching milling head. Background Technology

[0002] During the grounding construction of transmission line towers, to ensure the reliability of the grounding system and effectively reduce grounding resistance, it is usually necessary to excavate a grounding trench of a certain depth and width around the tower foundation. Then, grounding steel bars or flat steel are buried in the trench and backfilled with soil. This operation involves a large workload, especially in mountainous and hilly areas where hard rock geological conditions are often encountered. Traditional manual excavation methods are inefficient, labor-intensive, and difficult to guarantee the quality of trench formation.

[0003] In recent years, with the development of engineering machinery technology, integrated excavation and laying machines for grounding wire trenches under hard rock geological conditions in mountainous areas have been gradually applied in actual engineering projects, significantly improving construction efficiency and mechanization levels. These machines mostly use milling devices as the core rock-breaking mechanism, using a rotating cutterhead to drive a milling head to cut the soil and rock, achieving continuous trenching operations. However, existing milling head structures still have significant drawbacks in practical applications: due to the complex stress and limited space in the central area of ​​the cutterhead, most designs cannot place effective cutting tools in the central part, resulting in insufficient excavation of soil or soft rock in the middle area during trenching, forming a "ridge-like protrusion" extending longitudinally along the trench bottom (commonly known as the "ridge-like protrusion" phenomenon), seriously affecting the straight laying and backfill compaction of the subsequent grounding electrode. To solve this problem, a series of solutions have emerged in existing technologies.

[0004] For example, Chinese patent document CN108756922A discloses a milling head device, including a directional support rod, a housing base fixed to the directional support rod, and a cutter head assembly. The cutter head assembly includes a first milling roller, a second milling roller, and a cutter head drill. The cutter head drill is rotatably supported at the front end of the housing base around the output shaft axis of a first drive device. At least one positioning tube extends from each of the left and right sides of the housing base to support the first and second milling rollers. A second drive device is installed at the end of the positioning tube. The positioning tubes and the second drive device on the left and right sides of the housing base are respectively housed within the first and second milling rollers. The first and second milling rollers can rotate around the positioning tubes. Both the cutter head drill and the milling rollers are equipped with several cutter heads. During milling, the cutter head drill first drills a small circular hole, which loosens the area around the hole. The milling roller continues to mill around the circular hole, gradually increasing the milling area, which is convenient for milling hard materials. The cutter head assembly has a large milling coverage area and its external dimensions can be changed. It can also be used for stirring and other purposes, realizing multiple uses in one machine.

[0005] Although the aforementioned device solves the problem of incomplete milling in the middle area, its structure is complex and the overall size of the equipment is large, posing significant challenges in transportation and operation.

[0006] Therefore, a milling head for full-section trenching is needed to solve the above problems. Summary of the Invention

[0007] To address the aforementioned problem—specifically, the issue that existing milling heads sometimes fail to fully excavate the soil or soft rock in the middle section during operation—this invention provides a milling head for full-section trenching.

[0008] A milling head for full-section trenching includes a cutter head and an upper plate. A first side plate and a second side plate are fixedly installed on the bottom of the upper plate near both sides. A first inclined plate and a second inclined plate are fixedly installed on the bottom of the first and second side plates, respectively. Both the first and second inclined plates are gradually inclined inwards from top to bottom. Rotating tubes are rotatably installed on the outer sides of both the first and second inclined plates, forming a V-shape. The cutter head is installed on the outer surface of the rotating tubes. A motor is fixedly installed on the outer side of the second side plate. The rotating tubes are connected to the motor via a gear set. By setting the two rotating tubes in a V-shape and installing the cutter head on the outer surface of the rotating tubes, the device can ensure that the middle position can be dug during operation, effectively improving the quality of trenching.

[0009] Preferably, the first side plate and the second side plate are symmetrical about the middle position of the upper plate. A surrounding plate is fixedly installed on both sides of the first side plate and the second side plate. The first side plate, the second side plate, the first inclined plate, the second inclined plate, and the surrounding plate combine to form a box with a transparent top. A through hole is provided through the upper plate. A trapezoidal stiffening plate is fixedly installed on the top of the side of the surrounding plate. The upper surface of the stiffening plate is fixedly connected to the lower surface of the upper plate. A lifting lug is fixedly installed on the outer surface of the surrounding plate near the top. By combining the first side plate, the second side plate, the first inclined plate, the second inclined plate, and the surrounding plate to form a box with a transparent top, it can be ensured that soil or rocks broken during operation cannot enter the interior and affect the normal operation of the gear set. The stiffening plate can reinforce the connection of the various components of the device, and the lifting lug, together with the external pull rope, can prevent the device from falling.

[0010] Preferably, external supports are fixedly installed on the outer sides of both the first and second inclined plates. The two external supports are perpendicular to the first and second inclined plates, respectively. An inner rotating shaft is coaxially rotatably installed inside the outer support. The inner end of the inner rotating shaft extends to the inner side of the first and second inclined plates, and the outer end of the inner rotating shaft extends to the outside of the outer support. A rotating tube is coaxially rotatably installed outside the outer support. The position of the rotating tube near its outer end is fixedly connected to the position of the outer surface of the inner rotating shaft near its outer end. This arrangement allows the inner rotating shaft to drive the rotating tube to rotate when it rotates, thereby driving the cutter head to rotate. The external supports provide stable support for the rotation of the inner rotating shaft and the rotating tube.

[0011] Preferably, the motor is fixedly mounted on the outer side of the second side plate near the top via a motor mount. A welded shaft seat is fixedly mounted on the outer side of the first side plate near the top. A first shaft is rotatably mounted on the welded shaft seat. The end of the first shaft away from the welded shaft seat is coaxially and fixedly connected to the output shaft of the motor via a coupling.

[0012] Preferably, a mounting base is fixedly installed between the first side plate and the second side plate near the middle position. A second shaft is rotatably mounted on the top of the mounting base, and a third shaft is rotatably mounted on the bottom of the mounting base. The second shaft and the third shaft are coaxial and drivenly connected.

[0013] Preferably, the top and bottom of the mounting base are provided with coaxial bearing grooves, and the outer surfaces of the second shaft and the third shaft are coaxially provided with bearings, which are disposed in the bearing grooves. A central hole is coaxially passed between the two bearing grooves, and the bottom end of the second shaft and the top end of the third shaft rotate within the central hole. By providing bearing grooves and providing bearings on the second and third shafts, the smoothness and stability of the second and third shafts during rotation can be ensured.

[0014] Preferably, the gear set includes a first bevel gear, a second bevel gear, and a third bevel gear. The first bevel gear is coaxially fixedly mounted on the outer surface of the first shaft, the second bevel gear is coaxially fixedly mounted on the top end of the second shaft, the second bevel gear meshes with the first bevel gear, and the third bevel gear is coaxially fixedly mounted on the bottom end of the third shaft.

[0015] Preferably, the gear set further includes a fourth bevel gear, a fifth bevel gear, and a sixth bevel gear. The fourth bevel gear is coaxially fixedly mounted on the inner end of the inner rotating shaft on the second inclined plate, and the fourth bevel gear meshes with the third bevel gear. The fifth bevel gear is coaxially fixedly mounted on the end of the fourth bevel gear away from the inner rotating shaft, and the sixth bevel gear is coaxially fixedly mounted on the inner end of the inner rotating shaft on the first inclined plate, and the sixth bevel gear meshes with the fifth bevel gear. By setting multiple bevel gears, the power of the motor can be effectively transmitted to the inclined inner rotating shaft. According to the tilt angle requirement of the V-shaped milling head, the meshing angle of the bevel gears is determined. Power transmission is carried out through different included angles, which can ensure that the power and rotation speed distributed to each milling head are the same, thus guaranteeing the final milling effect.

[0016] Preferably, multiple cutter holders are fixedly installed on the outer surface of the rotating tube. Each cutter holder has a through-hole for mounting. The cutter head is installed inside the mounting hole. One end of each cutter holder has an indentation groove. A sliding ring is fixedly installed inside the indentation groove near its outer end. A sensor is located at the inner end of the indentation groove. The sliding ring is bonded to the inner surface of the indentation groove with strong adhesive. When the cutter head encounters something with a hardness exceeding the device's tolerance, the cutter head pushes the sliding ring to slide, breaking the bond and triggering the sensor.

[0017] Preferably, an upper rod is fixedly installed at the bottom end of the second shaft, and a lower rod is fixedly installed at the top end of the third shaft. A square tube is slidably installed on the outer surface of the lower rod. A retaining spring is provided between the bottom end of the square tube and the top end of the third shaft. An electromagnet is fixedly installed at the bottom end of the second shaft, and a permanent magnet is fixedly installed at the top end of the square tube. The electromagnet is connected to the sensor via an external controller. By setting the square tube, during normal operation, the square tube is simultaneously fitted onto the outer surfaces of the upper and lower rods under the retaining spring. When the cutter head encounters something with a hardness exceeding the hardness that the device can withstand, the sensor transmits a signal to the external controller, energizing the electromagnet and generating a repulsive force with the permanent magnet, pushing the square tube away from the upper rod, thus preventing the second shaft from driving the third shaft to rotate. This design allows the device to automatically disconnect the motor from the cutter head when encountering something too hard, effectively preventing damage to the components.

[0018] The beneficial effects of this invention are as follows: 1. By setting the two rotating tubes into a V-shape and installing the cutter head on the outer surface of the rotating tubes, this invention can ensure that the middle position can be dug during operation, effectively improving the quality of trenching.

[0019] 2. By setting multiple bevel gears, the power of the motor can be effectively transmitted to the inclined inner shaft. According to the tilt angle requirements of the V-shaped milling head, the meshing angle of the bevel gears is determined. By transmitting power through different included angles, it can be ensured that the power and rotation speed distributed to each milling head are the same, thus guaranteeing the final milling effect.

[0020] 3. By setting up a square tube, the present invention allows the device to be fitted onto the outer surfaces of both the upper and lower rods simultaneously under the pressure of the supporting spring during normal operation. When the cutter head encounters something with a hardness exceeding the device's tolerance, the sensor transmits a signal to the external controller, energizing the electromagnet and generating a repulsive force with the permanent magnet, pushing the square tube away from the upper rod. This prevents the second shaft from driving the third shaft to rotate. This design allows the device to automatically disconnect the motor from the cutter head when encountering something too hard, effectively preventing damage to the components. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic cross-sectional view of the tool holder structure of the present invention; Figure 4 This is a schematic diagram of the gear set structure of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the square tube of the present invention; Figure 6 This is a schematic cross-sectional view of the mounting base of the present invention; Figure 7 This is a schematic diagram of the first shaft structure of the present invention; Figure 8 This is a schematic diagram of the external support structure of the present invention; Figure 9 This is a schematic diagram of the rotating tube structure of the present invention; Figure 10 This is a schematic diagram of the bottom structure of the present invention.

[0022] In the picture: 1. Cutting head; 2. Upper plate; 3. First side plate; 4. Second side plate; 5. First inclined plate; 6. Second inclined plate; 7. Rotating tube; 8. Motor; 9. Enclosure plate; 10. Rib plate; 11. Lifting lug; 12. External support; 13. Inner rotating shaft; 14. Motor base; 15. Welded shaft base; 16. First shaft; 17. Mounting base; 18. Second shaft; 19. Third shaft; 20. Bearing groove; 21. Bearing; 22. Intermediate hole; 23. First bevel gear; 24. Second bevel gear; 25. Third bevel gear; 26. Fourth bevel gear; 27. Fifth bevel gear; 28. Sixth bevel gear; 29. ​​Cutting head; 30. Mounting hole; 31. Inner groove; 32. Sliding ring; 33. Sensor; 34. Upper rod; 35. Lower rod; 36. Square tube; 37. Support spring; 38. Electromagnet; 39. Permanent magnet. Detailed Implementation

[0023] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] like Figure 1-2 and Figure 9 As shown in the figure, this invention discloses a milling head for full-section trenching, including a cutter head 1 and an upper plate 2. A first side plate 3 and a second side plate 4 are fixedly installed on the bottom of the upper plate 2 near both sides. A first inclined plate 5 and a second inclined plate 6 are fixedly installed on the bottom of the first side plate 3 and the second side plate 4, respectively. The first inclined plate 5 and the second inclined plate 6 are both inclined inward from top to bottom. Rotating tubes 7 are rotatably installed on the outer side of the first inclined plate 5 and the second inclined plate 6. The two rotating tubes 7 are V-shaped. The cutter head 1 is installed on the outer surface of the rotating tubes 7. A motor 8 is fixedly installed on the outer side of the second side plate 4. The rotating tubes 7 are driven by the motor 8 through a gear set. By setting the two rotating tubes 7 into a V-shaped structure and installing the cutter head 1 on the outer surface of the rotating tubes 7, it can be ensured that the middle position can be dug during operation, which effectively improves the quality of trenching.

[0025] like Figure 1As shown, the first side plate 3 and the second side plate 4 are symmetrical about the middle position of the upper plate 2. The first side plate 3 and the second side plate 4 are fixedly installed with the surrounding plate 9 on both sides. The first side plate 3, the second side plate 4, the first inclined plate 5, the second inclined plate 6 and the surrounding plate 9 are combined to form a box with a transparent top. The upper plate 2 has a through hole. The top of the side of the surrounding plate 9 is fixedly installed with a trapezoidal stiffening plate 10. The upper surface of the stiffening plate 10 is fixedly connected to the lower surface of the upper plate 2. The outer surface of the surrounding plate 9 is fixedly installed with a lifting lug 11 near the top. By combining the first side plate 3, the second side plate 4, the first inclined plate 5, the second inclined plate 6 and the surrounding plate 9 to form a box with a transparent top, it can be ensured that the soil or rocks broken by the device during operation cannot enter the interior and affect the normal operation of the gear set. The stiffening plate 10 can reinforce the connection of the various components of the device. The lifting lug 11, together with the external pull rope, can prevent the device from falling.

[0026] like Figure 8 As shown, outer supports 12 are fixedly installed on the outer sides of the first inclined plate 5 and the second inclined plate 6, respectively. The two outer supports 12 are perpendicular to the first inclined plate 5 and the second inclined plate 6. An inner rotating shaft 13 is coaxially rotatably installed inside the outer support 12. The inner end of the inner rotating shaft 13 extends to the inner side of the first inclined plate 5 and the second inclined plate 6, and the outer end of the inner rotating shaft 13 extends to the outside of the outer support 12. A rotating tube 7 is coaxially rotatably installed outside the outer support 12. The position of the rotating tube 7 near the outer end is fixedly connected to the position of the outer surface of the inner rotating shaft 13 near the outer end. This arrangement allows the inner rotating shaft 13 to drive the rotating tube 7 to rotate when it rotates, thereby driving the cutter head 1 to rotate. The outer support 12 can provide stable support for the rotation of the inner rotating shaft 13 and the rotating tube 7.

[0027] like Figure 1-2 As shown, the motor 8 is fixedly mounted on the outer side of the second side plate 4 near the top via the motor base 14. A welded shaft seat 15 is fixedly mounted on the outer side of the first side plate 3 near the top. A first shaft 16 is rotatably mounted on the welded shaft seat 15. The end of the first shaft 16 away from the welded shaft seat 15 is coaxially fixedly connected to the output shaft of the motor 8 via a coupling.

[0028] like Figure 4 and Figure 6 As shown, a mounting base 17 is fixedly installed near the middle position between the first side plate 3 and the second side plate 4. A second shaft 18 is rotatably installed on the top of the mounting base 17, and a third shaft 19 is rotatably installed on the bottom of the mounting base 17. The second shaft 18 and the third shaft 19 are coaxial and drive-connected.

[0029] like Figure 4 and Figure 6As shown, the top and bottom of the mounting base 17 are provided with coaxial bearing grooves 20. The outer surfaces of the second shaft 18 and the third shaft 19 are both provided with bearings 21 coaxially. The bearings 21 are located in the bearing grooves 20. A central hole 22 is provided coaxially between the two bearing grooves 20. The bottom end of the second shaft 18 and the top end of the third shaft 19 rotate within the central hole 22. By providing bearing grooves 20 and providing bearings 21 on the second shaft 18 and the third shaft 19, the smoothness and stability of the second shaft 18 and the third shaft 19 during rotation can be guaranteed.

[0030] like Figure 2 and Figure 4 As shown, the gear set includes a first bevel gear 23, a second bevel gear 24 and a third bevel gear 25. The first bevel gear 23 is coaxially fixedly mounted on the outer surface of the first shaft 16. The second bevel gear 24 is coaxially fixedly mounted on the top end of the second shaft 18 and meshes with the first bevel gear 23. The third bevel gear 25 is coaxially fixedly mounted on the bottom end of the third shaft 19.

[0031] like Figure 4 As shown, the gear set also includes a fourth bevel gear 26, a fifth bevel gear 27, and a sixth bevel gear 28. The fourth bevel gear 26 is coaxially fixedly installed on the inner end of the inner rotating shaft 13 on the second inclined plate 6, and the fourth bevel gear 26 meshes with the third bevel gear 25. The fifth bevel gear 27 is coaxially fixedly installed on the end of the fourth bevel gear 26 away from the inner rotating shaft 13. The sixth bevel gear 28 is coaxially fixedly installed on the inner end of the inner rotating shaft 13 on the first inclined plate 5, and the sixth bevel gear 28 meshes with the fifth bevel gear 27. By setting multiple bevel gears, the power of the motor can be effectively transmitted to the inclined inner rotating shaft 13. According to the tilt angle requirements of the V-shaped milling head, the meshing angle of the bevel gears is determined. Power transmission is carried out through different included angles, which can ensure that the power and rotation speed distributed to each milling head are the same, thus ensuring the final milling effect.

[0032] like Figure 3 As shown, multiple cutter holders 29 are fixedly installed on the outer surface of the rotating tube 7. A mounting hole 30 is opened through the cutter holder 29, and the cutter head 1 is installed inside the mounting hole 30. An inner groove 31 is opened at one end of the cutter holder 29. A sliding ring 32 is fixedly installed inside the inner groove 31 near the outer end. A sensor 33 is set at the inner end of the inner groove 31. The sliding ring 32 is bonded to the inner surface of the inner groove 31 with strong adhesive. When the cutter head 1 encounters something with a hardness exceeding the hardness that the device can withstand, the cutter head 1 will push the sliding ring 32 to slide, breaking the bond, thereby triggering the sensor 33.

[0033] like Figure 5As shown, an upper rod 34 is fixedly installed at the bottom end of the second shaft 18, and a lower rod 35 is fixedly installed at the top end of the third shaft 19. A square tube 36 is slidably installed on the outer surface of the lower rod 35. A stop spring 37 is provided between the bottom end of the square tube 36 and the top end of the third shaft 19. An electromagnet 38 is fixedly installed at the bottom end of the second shaft 18, and a permanent magnet 39 is fixedly installed at the top end of the square tube 36. The electromagnet 38 is connected to the sensor 33 through an external controller. By setting the square tube 36, when the device is operating normally, the square tube 36... The abutting spring 37 is simultaneously sleeved on the outer surfaces of the upper rod 34 and the lower rod 35. When the cutter head 1 encounters something with a hardness exceeding that of the device, the sensor 33 transmits a signal to the external controller, energizing the electromagnet 38, which generates a repulsive force with the permanent magnet 39, pushing the square tube 36 away from the upper rod 34. This prevents the second shaft 18 from driving the third shaft 19 to rotate. This design allows the device to automatically disconnect the motor 8 from the cutter head 1 when it encounters something too hard, effectively preventing damage to the components.

[0034] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A milling head for full-section trenching, comprising a cutter head (1), characterized in that, It also includes an upper plate (2), on which a first side plate (3) and a second side plate (4) are fixedly installed near the bottom of the upper plate (2). A first inclined plate (5) and a second inclined plate (6) are fixedly installed at the bottom of the first side plate (3) and the second side plate (4). The first inclined plate (5) and the second inclined plate (6) are both inclined inward from top to bottom. Rotating tubes (7) are rotatably installed on the outer side of the first inclined plate (5) and the second inclined plate (6). The two rotating tubes (7) are V-shaped. The cutter head (1) is installed on the outer surface of the rotating tube (7). A motor (8) is fixedly installed on the outer side of the second side plate (4). The rotating tube (7) is driven and connected to the motor (8) through a gear set.

2. The milling head for full-section trenching according to claim 1, characterized in that, The first side plate (3) and the second side plate (4) are symmetrical about the middle position of the upper plate (2). The first side plate (3) and the second side plate (4) are fixedly installed with side panels (9). The first side plate (3), the second side plate (4), the first inclined plate (5), the second inclined plate (6) and the side panels (9) are combined to form a box with a transparent top. The upper plate (2) has a through hole. The top of the side panel (9) is fixedly installed with a trapezoidal rib plate (10). The upper surface of the rib plate (10) is fixedly connected to the lower surface of the upper plate (2). The outer surface of the side panel (9) is fixedly installed with a lifting lug (11) near the top.

3. A milling head for full-section trenching according to claim 2, characterized in that, An outer support (12) is fixedly installed on the outer side of the first inclined plate (5) and the second inclined plate (6). The two outer supports (12) are perpendicular to the first inclined plate (5) and the second inclined plate (6) respectively. An inner rotating shaft (13) is coaxially rotatably installed inside the outer support (12). The inner end of the inner rotating shaft (13) extends to the inner side of the first inclined plate (5) and the second inclined plate (6). The outer end of the inner rotating shaft (13) extends to the outside of the outer support (12). The rotating tube (7) is coaxially rotatably installed outside the outer support (12). The position of the rotating tube (7) near the outer end is fixedly connected to the position of the outer surface of the inner rotating shaft (13) near the outer end.

4. A milling head for full-section trenching according to claim 3, characterized in that, The motor (8) is fixedly mounted on the outer side of the second side plate (4) near the top via a motor seat (14). A welding shaft seat (15) is fixedly mounted on the outer side of the first side plate (3) near the top. A first shaft (16) is rotatably mounted on the welding shaft seat (15). The end of the first shaft (16) away from the welding shaft seat (15) is coaxially fixedly connected to the output shaft of the motor (8) via a coupling.

5. A milling head for full-section trenching according to claim 4, characterized in that, A mounting base (17) is fixedly installed between the first side plate (3) and the second side plate (4) near the middle position. A second shaft (18) is rotatably installed on the top of the mounting base (17), and a third shaft (19) is rotatably installed on the bottom of the mounting base (17). The second shaft (18) and the third shaft (19) are coaxial and drive-connected.

6. A milling head for full-section trenching according to claim 5, characterized in that, The mounting base (17) has coaxial bearing grooves (20) at its top and bottom. The outer surfaces of the second shaft (18) and the third shaft (19) are coaxially provided with bearings (21). The bearings (21) are located in the bearing grooves (20). A middle hole (22) is coaxially opened between the two bearing grooves (20). The bottom end of the second shaft (18) and the top end of the third shaft (19) rotate within the middle hole (22).

7. A milling head for full-section trenching according to claim 6, characterized in that, The gear set includes a first bevel gear (23), a second bevel gear (24), and a third bevel gear (25). The first bevel gear (23) is coaxially fixedly mounted on the outer surface of the first shaft (16). The second bevel gear (24) is coaxially fixedly mounted on the top end of the second shaft (18). The second bevel gear (24) meshes with the first bevel gear (23). The third bevel gear (25) is coaxially fixedly mounted on the bottom end of the third shaft (19).

8. A milling head for full-section trenching according to claim 7, characterized in that, The gear set also includes a fourth bevel gear (26), a fifth bevel gear (27), and a sixth bevel gear (28). The fourth bevel gear (26) is coaxially fixedly mounted on the inner end of the inner rotating shaft (13) on the second inclined plate (6). The fourth bevel gear (26) meshes with the third bevel gear (25). The fifth bevel gear (27) is coaxially fixedly mounted on the end of the fourth bevel gear (26) away from the inner rotating shaft (13). The sixth bevel gear (28) is coaxially fixedly mounted on the inner end of the inner rotating shaft (13) on the first inclined plate (5). The sixth bevel gear (28) meshes with the fifth bevel gear (27).

9. A milling head for full-section trenching according to claim 8, characterized in that, Multiple tool holders (29) are fixedly installed on the outer surface of the rotating tube (7). A mounting hole (30) is opened through the tool holder (29). The tool head (1) is installed inside the mounting hole (30). An inner groove (31) is opened at one end of the tool holder (29). A sliding ring (32) is fixedly installed inside the inner groove (31) near the outer end. A sensor (33) is provided at the inner end of the inner groove (31).

10. A milling head for full-section trenching according to claim 9, characterized in that, An upper rod (34) is fixedly installed at the bottom end of the second shaft (18), and a lower rod (35) is fixedly installed at the top end of the third shaft (19). A square tube (36) is slidably installed on the outer surface of the lower rod (35). A push-off spring (37) is provided between the bottom end of the square tube (36) and the top end of the third shaft (19). An electromagnet (38) is fixedly installed at the bottom end of the second shaft (18), and a permanent magnet (39) is fixedly installed at the top end of the square tube (36). The electromagnet (38) is connected to the sensor (33) through an external controller.

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