Non-excavation reamer bit

Abstract

The utility model relates to a trenchless reamer bit which comprises a mounting shaft, a first circular truncated cone is arranged on the mounting shaft, a plurality of bit legs are arranged on the first circular truncated cone, cones are arranged on the bit legs, a plurality of movable grooves are formed in the first circular truncated cone, fixed shafts are arranged in the movable grooves, and the fixed shafts are arranged on the first circular truncated cone. The middles of the bit legs are hinged to the fixing shafts respectively, and the mounting shaft is further provided with a plurality of control assemblies used for controlling rotation of the bit legs respectively. The distance between the multiple cones is adjusted by rotating the multiple cone palms, and therefore the chambering radius of the drill bit is changed.

Description

Technical Field

[0001] The utility model relates to the field of hole enlarging machinery, in particular to a trenchless hole enlarging drill bit. Background Art

[0002] Chinese patent with announcement number CN219262293U discloses a large-diameter guide reaming gear, including a cylindrical body, the upper end of the cylindrical body is set as a truncated cone part, a support plate is set below the truncated cone part, the lower part of the support plate is set with a gear palm, and a gear is set on the gear palm.

[0003] The tooth angle of the above-mentioned product cannot be adjusted. When expanding holes of different diameters, the reamer must be stopped, and then a new drill bit must be replaced on the drilling machine, and then the hole must be expanded again. However, replacing the drill bit is very time-consuming, which will reduce the construction efficiency of the hole expansion. Utility Model Content

[0004] The present application provides a trenchless reaming drill bit, which adjusts the distance between multiple cones by rotating multiple tooth palms, thereby changing the reaming radius of the drill bit, so that there is no need to replace the drill bit when reaming.

[0005] The present application provides a trenchless reaming drill bit that adopts the following technical solution:

[0006] A trenchless reaming drill bit comprises a mounting shaft, wherein a first truncated cone is provided on the mounting shaft, a plurality of tooth palms are provided on the first truncated cone, each of the plurality of tooth palms is provided with a gear, a plurality of movable grooves are provided on the first truncated cone, each of the plurality of movable grooves is provided with a fixed shaft, the plurality of tooth palms are respectively hinged on the plurality of fixed shafts, and the mounting shaft is also provided with a plurality of control components for respectively controlling the rotation of the plurality of tooth palms.

[0007] By adopting the above technical solution, when the drill bit needs to expand a hole of a different diameter after expanding the hole once, the restrictions on the multiple palms by the multiple control components are released, and then the multiple palms are rotated to make the multiple gears move away from the mounting axis, so that the expansion space of the drill bit can be expanded. After the positions of the multiple palms are adjusted, the multiple sets of control components can be used again to limit the rotation of the multiple palms.

[0008] Preferably, a second frustum is further provided on the mounting shaft, the second frustum is located on a side of the first frustum closer to the head of the mounting shaft, a plurality of cutter bodies are provided on the second frustum, and the plurality of cutter bodies are respectively connected to the mounting shaft.

[0009] By adopting the above technical solution, the provision of multiple cutter heads can further improve the efficiency of drill hole expansion.

[0010] Preferably, the control component includes a fixed block arranged on the mounting shaft, a plurality of first sockets opened on the fixed block, and a second socket opened on the end of the tooth palm away from the gear, for inserting a first bolt and a nut arranged in the first socket and the second socket, and the gear and the second socket are respectively located on both sides of the first cone, and during the rotation of the tooth palm, the second socket will be respectively connected to the plurality of first sockets.

[0011] By adopting the above technical solution, after the tooth palm is rotated, the second socket is aligned with one of the first sockets, and then the first bolt is inserted into the second socket and the first socket, and the nut is screwed onto the first bolt. At this time, the nut and the nut of the first bolt are respectively located on both sides of the tooth palm and the fixed block, thereby fixing the first bolt in the first socket and the second socket, thereby completing the restriction of the rotation of the tooth palm.

[0012] Preferably, the number of the fixing blocks is two, and the two fixing blocks in the same group of the control components are respectively located on both sides of the same tooth palm movement path, and the first plug holes on the two adjacent fixing blocks are arranged opposite to each other.

[0013] By adopting the above technical solution, when fixing the tooth palm, the first bolt is passed through the first insertion hole on one of the fixing blocks, then through the second insertion hole, and then through the first through hole on the other fixing block, and then the first bolt is fixed with a nut. During the rotation of the drill bit, the first bolt is located at the connection between the tooth palm and the fixing block and will be subjected to a large shear force. Therefore, by providing two fixing blocks, the shear force on the first bolt when the drill bit rotates is dispersed, thereby reducing the probability of the first bolt breaking during the drill bit hole expansion process.

[0014] Preferably, the plurality of fixing blocks are all located on a side of the first truncated cone away from the mounting shaft head, and the plurality of fixing blocks are all connected to the first fixing plate.

[0015] By adopting the above technical solution, the multiple fixing blocks act as reinforcing ribs for the first frustum, thereby enhancing the strength of the first frustum and preventing the first frustum from being deformed due to the pressure of multiple teeth when the drill is expanding the hole.

[0016] Preferably, a plurality of first threaded holes are opened on the side wall of the first truncated cone, the plurality of first threaded holes are respectively connected to a plurality of movable grooves, the plurality of fixed shafts are respectively threadedly connected in the plurality of first threaded holes, and the plurality of pressure palms are respectively movably connected to the fixed shafts located in the movable grooves.

[0017] By adopting the above technical solution, when there is a problem with the tooth palm and the cone, the fixed shaft can be removed from the first threaded hole, and the problematic tooth palm and cone can be removed from the drill bit for repair or replaced with a new one.

[0018] Preferably, a second threaded hole is formed on the cone, and the end of the cone palm is threadedly connected in the second threaded hole.

[0019] By adopting the above technical solution, when the cone is worn and cannot be used during the hole enlarging process of the drill bit, the cone can be unscrewed from the tooth palm and replaced with a new one, thereby ensuring the hole enlarging efficiency of the drill bit.

[0020] Preferably, a third threaded hole is provided on the gear, a second bolt is threadedly connected to the third threaded hole, the third threaded hole is connected to the second threaded hole, and a fourth threaded hole that matches the thread of the second bolt is opened on the tooth palm.

[0021] By adopting the above technical solution, the second bolt can be screwed into the third threaded hole and the fourth threaded hole to further fix the cone and the tooth palm, thereby preventing the cone and the tooth palm from being separated during the rotation of the drill bit. At the same time, when removing the worn cone from the tooth palm, the second bolt is screwed into the fourth threaded hole, and the worn cone can be rotated by directly pushing the second bolt, thereby removing the worn cone from the tooth palm. Because the surface of the cone is a smooth curved surface, it is relatively difficult to rotate the cone without the second bolt.

[0022] The technical effects of this utility model are mainly reflected in the following aspects:

[0023] 1. The utility model can rotate the tooth palm by passing the first bolt through two different first insertion holes and the second insertion hole, thereby adjusting the distance between multiple cones, thereby changing the hole expansion radius of the drill bit;

[0024] 2. The utility model provides a fixed block on both sides of each tooth palm movement path to disperse the shear force on the first bolt when the drill bit rotates, thereby reducing the probability of the first bolt breaking during the drill bit hole expansion process;

[0025] 3. The utility model sets the cone and the tooth palm as a detachable and replaceable structure, so that the worn cone can be replaced after the drill bit has been used for a period of time, thereby ensuring the hole expansion efficiency of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of this application.

[0027] Figure 2 yes Figure 1 Structural schematic diagram of an installation shaft, a first frustum, a second frustum, a plurality of fixing blocks, and a fixing shaft.

[0028] Figure 3 It is a structural schematic diagram of the tooth palm, the tooth wheel and the second bolt.

[0029] Figure numerals: 1. mounting shaft; 11. head; 2. first cone; 21. movable groove; 22. first threaded hole; 3. tooth palm; 31. second plug hole; 32. fourth threaded hole; 4. gear; 41. second threaded hole; 42. third threaded hole; 5. fixed shaft; 6. control assembly; 61. fixed block; 62. first plug hole; 63. first bolt; 64. nut; 7. second cone; 71. cutter body; 8. second bolt. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings to make the technical solution of the present application easier to understand and grasp.

[0031] Reference Figure 1 A trenchless reaming drill bit of the present embodiment includes a mounting shaft 1, on the side of the mounting shaft 1 close to the head 11, a first frustum 2 and a second frustum 7 are fixed, the second frustum 7 is located on the side of the first frustum 2 closer to the head 11 of the mounting shaft 1, a plurality of cutter bodies 71 are fixed on the second frustum 7, and the plurality of cutter bodies 71 are respectively connected to the mounting shaft 1.

[0032] Reference Figure 1 and Figure 2 The side wall of the first truncated table 2 is provided with three movable grooves 21 in a direction perpendicular to the axis of the first truncated table 2. Meanwhile, the side wall of the first truncated table 2 is provided with three first threaded holes 22 in a direction perpendicular to the axis of the first truncated table 2. The three first threaded holes 22 are connected to the three movable grooves 21 respectively. The three first threaded holes 22 are all threadedly connected with the fixed shaft 5.

[0033] Reference Figure 1 and Figure 2 A tooth palm 3 is provided in each of the three movable grooves 21. The middle parts of the three tooth palms 3 are respectively hinged on three fixed shafts 5 on the shaft body located in the movable groove 21. One end of the three tooth palms 3 is located between the first frustum 2 and the second frustum 7, and the other end of the three tooth palms 3 is located on the side of the first frustum 2 away from the second frustum 7.

[0034] Reference Figure 1 and Figure 3 The three teeth palms 3 are provided with a gear wheel 4 at one end between the first truncated cone 2 and the second truncated cone 7. The gear wheel 4 is provided with a second threaded hole 41 along its axial direction. The end of the gear wheel 3 is threadedly connected in the second threaded hole 41. At the same time, the gear wheel 4 is provided with a third threaded hole 42. The third threaded hole 42 is threadedly connected with a second bolt 8. The third threaded hole 42 is connected to the second threaded hole 41. The gear wheel 3 is provided with a fourth threaded hole 32 threadedly matched with the second bolt 8. After the gear wheel 4 is screwed onto the tooth palm 3, the stability of the connection between the gear wheel 4 and the tooth palm 3 can be enhanced by threading the second bolt 8 into the third threaded hole 42 and the fourth threaded hole 32 respectively.

[0035] Reference Figure 1 and Figure 2 , three groups of control components 6 are also arranged on the installation shaft 1, and the three groups of control components 6 are used to control the rotation of the three tooth palms 3 respectively. One group of control components 6 includes two fixing blocks 61 fixed on the installation shaft 1, a plurality of first plug holes 62 opened on the fixing blocks 61, a second plug hole 31 opened on one end of one tooth palm 3 away from the gear 4, and a first bolt 63 and a nut 64 for being inserted into the two first plug holes 62 and the second plug hole 31. The plurality of first plug holes 62 on each fixing block 61 are arranged equidistantly on the fixing block 61 along the rotation direction of the adjacent tooth palms 3.

[0036] Reference Figure 1 and Figure 2 The six fixed blocks 61 of the three control components 6 are all located on the side of the first truncated platform 2 away from the second truncated platform 7, and the six fixed blocks 61 are all fixedly connected to the first truncated platform 2, which strengthens the first truncated platform 2. The two fixed blocks 61 of a control component 6 are respectively located on both sides of the motion path of a tooth palm 3. During the rotation of the tooth palm 3, the second socket 31 on a tooth palm 3 will be connected to the two first sockets 62 located on the same height on both sides of the tooth palm 3 in sequence.

[0037] Reference Figure 1 and Figure 2 When the distance between the cones 4 needs to be changed to change the diameter of the drill hole expansion, firstly, three bolts are pulled out from the six fixed blocks 61 and the three tooth palms 3, and then one tooth palm 3 is rotated to make the cone 4 move away from the installation shaft 1. After the tooth palm 3 is rotated, the second insertion hole 31 is aligned with the two first insertion holes 62 at the same height on both sides of the tooth palm 3, and then the first bolt 63 is inserted into the first insertion hole 62, the second insertion hole 31, and the first insertion hole 62 at one time, and the nut 64 is screwed onto the first bolt 63. At this time, the nut 63 and the nut 64 of the first bolt 63 are respectively located on both sides of the two fixed blocks 61, so that the first bolt 63 is fixed in the first insertion hole 62 and the second insertion hole 31, thereby completing the adjustment of one tooth palm 3. Then the remaining two tooth palms 3 are also adjusted according to the above steps, and finally the distance between the three cones 4 and the installation shaft 1 is made the same, so that the adjustment of the drill hole expansion diameter is completed.

[0038] Reference Figure 1-Figure 3If the tooth palm 3 is damaged during the use of the drill bit, the fixed shaft 5 hinged to the damaged tooth palm 3 can be unscrewed from the first truncated cone 2 to remove the damaged tooth palm 3 for repair or replacement. It is even easier when the cone 4 is worn and needs to be replaced. First, the second bolt 8 is screwed into the fourth threaded hole 32. At this time, the second bolt 8 can be directly pushed to rotate with the worn cone 4, so that the worn cone 4 can be removed from the tooth palm 3. Then the second bolt 8 is unscrewed from the worn cone 4 and installed in the third threaded hole 42 of the new cone 4, and then the new cone 4 is screwed back onto the tooth palm 3, and then the second bolt 8 located in the new cone 4 is screwed back into the fourth threaded hole 32 to complete the replacement and installation of the cone 4 without replacing the entire drill bit.

[0039] Of course, the above are only typical examples of the present application. In addition, the present application may have many other specific implementation methods. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present application.

Claims

1. A trenchless reaming drill bit, comprising a mounting shaft (1), a first truncated cone (2) being provided on the mounting shaft (1), a plurality of tooth palms (3) being provided on the first truncated cone (2), and a plurality of tooth palms (3) being provided on each of the plurality of tooth palms (3), wherein: The first truncated table (2) is provided with a plurality of movable grooves (21), each of the plurality of movable grooves (21) is provided with a fixed shaft (5), the middle parts of the plurality of tooth palms (3) are respectively hinged on the plurality of fixed shafts (5), and the mounting shaft (1) is also provided with a plurality of control components (6) for respectively controlling the rotation of the plurality of tooth palms (3).

2. A trenchless reaming drill bit according to claim 1, characterized in that: A second truncated cone (7) is also provided on the mounting shaft (1), the second truncated cone (7) being located on a side of the first truncated cone (2) closer to the head (11) of the mounting shaft (1), and a plurality of knife bodies (71) are provided on the second truncated cone (7), the plurality of knife bodies (71) being respectively connected to the mounting shaft (1).

3. The trenchless reaming drill bit according to claim 1, characterized in that: The control assembly (6) comprises a fixing block (61) arranged on the mounting shaft (1), a plurality of first plug holes (62) provided on the fixing block (61), and a second plug hole (31) provided on an end of the tooth palm (3) away from the gear (4), and is used for inserting a first bolt (63) and a nut (64) provided in the first plug hole (62) and the second plug hole (31). The gear (4) and the second plug hole (31) are respectively located on two sides of the first truncated table (2). When the tooth palm (3) rotates, the second plug hole (31) is respectively connected to the plurality of first plug holes (62).

4. A trenchless reaming drill bit according to claim 3, characterized in that: There are two fixed blocks (61), and the two fixed blocks (61) in the same group of control components (6) are respectively located on both sides of the same tooth palm (3) movement path, and the first plug holes (62) on the two adjacent fixed blocks (61) are arranged opposite to each other.

5. A trenchless reaming drill bit according to claim 4, characterized in that: The plurality of fixing blocks (61) are all located on a side of the first truncated table (2) away from the head (11) of the mounting shaft (1), and the plurality of fixing blocks (61) are all connected to the first fixing plate.

6. The trenchless reaming drill bit according to claim 1, characterized in that: A plurality of first threaded holes (23) are provided on the side wall of the first truncated table (2), the plurality of first threaded holes (23) are respectively connected to the plurality of movable grooves (21), the plurality of fixed shafts (5) are respectively threadedly connected in the plurality of first threaded holes (23), and the plurality of tooth palms are respectively movably connected to the fixed shafts (5) located in the movable grooves (21).

7. The trenchless reaming drill bit according to claim 2, characterized in that: The tooth wheel (4) is provided with a second threaded hole (41), and the end of the tooth palm (3) is threadedly connected in the second threaded hole (41).

8. The trenchless reaming drill bit according to claim 7, characterized in that: The tooth wheel (4) is provided with a third threaded hole (42), the inner thread of the third threaded hole (42) is connected to a second bolt (8), the third threaded hole (42) is connected to the second threaded hole (41), and the tooth palm (3) is provided with a fourth threaded hole (32) threadably matched with the second bolt (8).

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