Reaming drilling tool for raise boring machine

Abstract

The invention discloses a reaming drilling tool for a raise boring machine. The reaming drilling tool comprises a cutterhead, and a vertically extending connecting shaft is arranged at the center of the upper surface of the cutterhead; the cutter assemblies are arranged at intervals in the circumferential direction of the connecting shaft, each cutter assembly comprises a cutter holder and a hobbing cutter, the cutter holders are installed on the upper surface of the cutter head, the positions of the cutter holders can be adjusted in the radial direction of the connecting shaft, and the hobbing cutters are rotationally arranged on the cutter holders. The tool apron is adjustably arranged on the cutterhead in the radial direction of the connecting shaft, so that when the hole diameter of the forward drilling hole is small, the tool assemblies are distributed on the side, close to the connecting shaft, of the cutterhead, and meanwhile, the tool assemblies are also distributed on the side, away from the connecting shaft, of the cutterhead, and when the hole diameter of the forward drilling hole is large, the tool assemblies are distributed on the cutterhead. The cutter assembly on the side, close to the connecting shaft, of the cutter head can be adjusted outwards, hobs at all the positions can fully play a role, and therefore the guide hole drilling tool can be matched with guide hole drilling tools of various different specifications, and the application scene is wide.

Description

Technical Field

[0001] The invention relates to the technical field of raise boring machines, and in particular to a hole-reaming drill tool for raise boring machines. Background Art

[0002] The raise drilling rig uses the motor of the drilling rig to drive the hydraulic motor, which drives the faucet and uses hydraulic power to transmit torque to the drilling tool system, driving the drill rod and drilling tools to rotate. Under the action of drilling pressure, the rollers on the guide hole drilling tool or the reaming drilling tool do pure rolling or slight sliding along the rock working surface at the bottom of the well. At the same time, the axial tension and pressure generated by the main engine cylinder also act on the guide hole drilling tool or the reaming drilling tool through the power head and the drill rod, so that the roller teeth have impact, extrusion and shearing effects on the rock, breaking the rock. After the drill rod drills from top to bottom to the bottom of the well, the drilling tool is replaced with a reverse reaming drilling tool, and the hole is reamed from bottom to top.

[0003] A hole reaming drill generally includes a cutterhead, a cutter holder, and a roller cutter. The cutterhead is connected to the drill rod through a connecting shaft thereon, the cutter holder is mounted on the cutterhead, and the roller cutter is rotatably mounted on the cutter holder. The roller cutter is usually a columnar structure, and multiple roller cutters and cutter holders are provided, and are distributed on circles of different radii centered on the axis of the connecting shaft. In the existing structural design, the cutter holder is completely fixed on the cutterhead, and the position of each cutter holder is fixed. This structural form has certain limitations, that is, a hole reaming drill of one specification cannot be matched with a plurality of specifications of guide hole drills, and the use scenario is limited. When the guide hole drills have different specifications, the corresponding forward drilling holes have different apertures. If the aperture of the forward drilling hole is larger, when the hole is reamed in the reverse direction, the roller cutter on the hole reaming drill close to the connecting shaft may not be able to contact the soil or rock and cannot play a role. Therefore, there is an urgent need for a hole reaming drill with a wider application scenario and capable of matching a plurality of specifications of guide hole drills. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a hole-reaming drill for a raise boring machine, which has a wide range of application scenarios.

[0005] The hole reaming drilling tool for a raise boring machine according to an embodiment of the present invention comprises: A cutter disc, wherein a vertically extending connecting shaft is provided at the center of the upper surface of the cutter disc; A plurality of tool assemblies are arranged at intervals along the circumference of the connecting shaft, and the tool assembly includes a tool holder and a roller cutter. The tool holder is installed on the upper surface of the cutter disc and can be adjusted in position along the radial direction of the connecting shaft. The roller cutter is rotatably arranged on the tool holder.

[0006] The hole reaming drill for a raise boring machine according to the embodiment of the present invention has at least the following beneficial effects: By setting multiple tool assemblies and setting the tool holder on the cutter disc in a radially adjustable position along the connecting shaft, when the outer ring size of the guide hole drill for forward drilling is small, resulting in a small hole diameter of the forward drilling, the position of part of the tool holder can be adjusted so that the tool assembly is distributed on the side of the cutter disc close to the connecting shaft, and the tool assembly is also distributed on the side of the cutter disc away from the connecting shaft. When the outer ring size of the guide hole drill for forward drilling is large, resulting in a large hole diameter of the forward drilling, the tool holder can be adjusted to adjust the tool assembly on the side of the cutter disc close to the connecting shaft outward, so that when reverse reaming, the rollers at various positions can contact the rock or soil, so as to give full play to the role of each roller and ensure the effect of reverse reaming. In this way, the reaming drill for the reverse drilling rig of this embodiment can match a variety of guide hole drills of different specifications, and has a wider application scenario.

[0007] According to some embodiments of the present invention, a group of positioning holes is provided on the upper surface of the knife disc corresponding to any of the knife seats, and the group of positioning holes includes a plurality of positioning holes arranged radially along the connecting shaft, and the knife seat can be slidably arranged on the knife disc radially along the connecting shaft, and a vertically adjustable locking mechanism is provided on the knife seat, and the locking mechanism can be at least partially inserted into the positioning holes to limit the radial sliding of the knife seat along the connecting shaft, wherein when the knife seat slides radially along the connecting shaft to multiple positions, there are corresponding positioning holes that cooperate with the locking mechanism.

[0008] According to some embodiments of the present invention, the locking mechanism includes a locking part and an elastic part, the locking part is vertically slidably installed on the knife seat, the locking part is used to be inserted into the positioning hole, and the elastic part is used to apply a downward elastic force to the locking part so that the locking part can be inserted into the positioning hole.

[0009] According to some embodiments of the present invention, the locking portion is provided with a plurality of insertion rods, and the plurality of insertion rods are arranged at intervals along the radial direction of the connecting shaft, and the insertion rods are used to be inserted into the positioning holes, and the spacing between any two adjacent positioning holes in the same group is equal to the spacing between any two adjacent insertion rods, and the number of the positioning holes is greater than the number of the insertion rods.

[0010] According to some embodiments of the present invention, the locking portion is provided with an abutment plate, a mounting rod and an insertion rod, the mounting rod is provided at one end of the abutment plate facing away from the positioning hole, the mounting rod is vertically slid through the knife seat, the elastic portion is configured as a spring, the spring is sleeved on the mounting rod, and the two ends of the spring respectively abut the abutment plate and the knife seat, and the insertion rod is provided at one end of the abutment plate facing the positioning hole, for being inserted into the positioning hole.

[0011] According to some embodiments of the present invention, a receiving groove with an open bottom end is provided at the bottom of the knife seat, and the spring is located on the inner side of the receiving groove.

[0012] According to some embodiments of the present invention, the accommodating groove penetrates the knife seat along the radial direction of the connecting shaft, and the abutment plate extends out of the accommodating groove at both ends along the radial direction of the connecting shaft and is provided with a lifting portion, the lifting portion closes the open end of the accommodating groove along the radial direction of the connecting shaft, and by lifting the lifting portion, the abutment plate can be driven to move vertically away from the positioning hole.

[0013] According to some embodiments of the present invention, a mounting position with a top opening is provided on the top of the tool holder, the hob is located in the mounting position, and the tool holder is provided with mounting parts on opposite sides of the axial direction of the hob, respectively, the mounting parts on both sides respectively abut against opposite sides of the axial direction of the hob, and the mounting parts on both sides respectively cooperate with the hob for rotation, wherein the mounting parts on both sides can adjust the position along the axial direction of the hob and separate the mounting parts from the hob.

[0014] According to some embodiments of the present invention, bearings are respectively installed at both ends of the axial direction of the hob, and the bearings are coaxially distributed with the hob. The mounting portion is provided with a mounting shaft, and the mounting shaft can be arranged on the cutter seat so as to be able to adjust the position along the axial direction of the hob. The mounting shaft includes a first section and a second section, and a step surface is formed between the first section and the second section. The inner ring of the bearing is sleeved on the first section and abuts against the step surface.

[0015] According to some embodiments of the present invention, mounting grooves are respectively provided at both ends of the axial direction of the hob, and sealing end covers for closing the mounting grooves are provided on the outer sides of the mounting grooves, the bearings are assembled in the mounting grooves, and the mounting shaft passes through the sealing end covers.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 is a schematic diagram of the installation structure of an embodiment of the present invention; Figure 2 is a cross-sectional schematic diagram of an embodiment of the present invention; Figure 3 is a schematic structural diagram of a tool assembly according to an embodiment of the present invention; Figure 4 is a cross-sectional schematic diagram of a tool assembly according to an embodiment of the present invention; Figure 5 It is a schematic diagram of the structural decomposition of the tool assembly of an embodiment of the present invention.

[0018] Figure Number: Cutter disc 100, positioning hole 101, connecting shaft 110, guide rail 120; Tool assembly 200, tool holder 210, accommodating groove 211, mounting position 212, threaded hole 213, hob 220, mounting groove 221, sealing end cover 222, locking portion 230, insertion rod 231, abutment plate 232, mounting rod 233, lifting portion 234, limiting nut 235, elastic portion 240, bearing 250, mounting shaft 260, first section 261, second section 262, step surface 263, knob 264. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0021] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0022] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0023] Reference Figure 1 As shown, a hole reaming drill for a raise boring machine according to an embodiment of the present invention comprises: a cutter head 100 and a plurality of cutter assemblies 200 .

[0024] A vertically extending connecting shaft 110 is provided at the center of the upper surface of the cutter head 100 , and the connecting shaft 110 is used to connect with the drill rod.

[0025] A plurality of tool assemblies 200 are arranged at intervals along the circumference of the connecting shaft 110 . The tool assembly 200 includes a tool holder 210 and a roller cutter 220 . The tool holder 210 is mounted on the upper surface of the cutter disc 100 and can be adjusted in position radially along the connecting shaft 110 . The roller cutter 220 is rotatably disposed on the tool holder 210 .

[0026] The reaming drill for a raise boring machine according to the embodiment of the present invention is provided with a plurality of tool assemblies 200, and a tool holder 210 is provided on the cutter head 100 so that the position thereof can be adjusted along the radial direction of the connecting shaft 110. Thus, when the outer ring size of the guide hole drill for forward drilling is small, resulting in a small hole diameter for forward drilling, the positions of some tool holders 210 can be adjusted so that the tool assemblies 200 are distributed on the side of the cutter head 100 close to the connecting shaft 110, and the tool assemblies are also distributed on the side of the cutter head 100 far from the connecting shaft 110. 200, and when the outer ring size of the guide drill bit for forward drilling is larger, resulting in a larger hole diameter for the forward drilling, the tool assembly 200 on the side of the cutter disc 100 close to the connecting shaft 110 can be adjusted outward by adjusting the tool holder 210, so that when the hole is expanded in the reverse direction, the rollers 220 at various positions can contact the rock or soil, so as to give full play to the role of each roller 220 and ensure the effect of reverse expansion. In this way, the expansion drill bit for the reverse drilling rig of this embodiment can match a variety of guide drill bits of different specifications, and has a wider application scenario.

[0027] In addition, it should be noted that no matter how the position of each tool assembly 200 is adjusted, it is necessary to ensure that the tool assembly 200 is distributed on the outermost edge of the cutter disc 100 .

[0028] It is understandable that in order to prevent soil or rock from accumulating on the cutter disc 100 during reverse hole expansion, a plurality of fan-shaped notches are provided on the outer edge of the cutter disc 100 .

[0029] Reference Figure 1 and Figure 2As shown, it can be understood that a group of positioning holes 101 are provided on the upper surface of the cutter disc 100 corresponding to any cutter seat 210, and the plurality of groups of positioning holes 101 are evenly arranged along the circumference of the connecting shaft 110. A group of positioning holes 101 includes a plurality of positioning holes 101 arranged along the radial direction of the connecting shaft 110, and the positioning holes 101 vertically penetrate the cutter disc 100. The cutter seat 210 can be slidably arranged on the cutter disc 100 along the radial direction of the connecting shaft 110, and a locking mechanism that can be adjusted vertically is provided on the cutter seat 210, and the locking mechanism can be adjusted to A small portion is inserted into the positioning hole 101 to limit the radial sliding of the tool holder 210 along the connecting shaft 110, thereby positioning the tool holder 210 on the tool disc 100. Obviously, the locking mechanism can be adjusted to be separated from the positioning hole 101 so that the tool holder 210 can slide radially along the connecting shaft 110. When the tool holder 210 slides radially along the connecting shaft 110 to multiple positions, there are corresponding positioning holes 101 that cooperate with the locking mechanism to realize the radial position adjustment of the tool holder 210 along the connecting shaft 110. In some specific embodiments, a group of guide rails 120 is provided on the tool disc 100 corresponding to each tool seat 210. A group of guide rails 120 includes two guide rails 120, which are respectively located on opposite sides of the tool seat 210. The facing sides of the two guide rails 120 are provided with horizontally extending guide limit grooves. The opposite ends of the tool seat 210 are respectively slidably matched with the guide limit grooves of the two guide rails 120. Through the sliding cooperation between the guide limit grooves and the tool seat 210, the sliding direction of the tool seat 210 is limited to the radial direction of the connecting shaft 110. Furthermore, both ends of the extension direction of the guide limit grooves are opened to facilitate the removal of the tool seat 210 from the tool disc 100 for maintenance and replacement.

[0030] Reference Figure 2 and Figure 4 As shown, in some embodiments of the present invention, the locking mechanism includes a locking portion 230 and an elastic portion 240. The locking portion 230 is vertically slidably installed on the knife seat 210. The locking portion 230 is used to be inserted into the positioning hole 101 to limit the radial sliding of the knife seat 210 along the connecting shaft 110. The elastic portion 240 is used to apply a downward elastic force to the locking portion 230 so that the locking portion 230 can be inserted into the positioning hole 101 and the locking portion 230 remains inserted into the positioning hole 101. When the position of the knife seat 210 needs to be adjusted, a force opposite to the elastic force of the elastic portion 240 is applied to the locking portion 230 to separate the locking portion 230 from the positioning hole 101, and then the knife seat 210 is slid to the corresponding position along the radial direction of the connecting shaft 110, and then the external force is removed, so that the locking portion 230 is inserted into the positioning hole 101 at the corresponding position under the action of the elastic force of the elastic portion 240, and the knife seat 210 is repositioned, that is, the position adjustment of the knife seat 210 is completed, and the operation is very convenient. It is obvious that when the knife holder 210 slides to multiple positions along the radial direction of the connecting shaft 110 , there are corresponding positioning holes 101 for the locking portion 230 to be inserted into.

[0031] Reference Figure 2 , Figure 4 and Figure 5 As shown, in some embodiments of the present invention, a plurality of vertically extending insertion rods 231 are provided at the bottom end of the locking portion 230, and the plurality of insertion rods 231 are arranged at intervals along the radial direction of the connecting shaft 110, and the insertion rods 231 are used to be inserted into the positioning holes 101 to limit the radial sliding of the tool holder 210 along the connecting shaft 110. By providing a plurality of insertion rods 231, the stability of the positioning of the tool holder 210 can be improved, and the structure is more solid and reliable; in addition, the spacing between any two adjacent positioning holes 101 in the same group is equal to the spacing between any two adjacent insertion rods 231, and the number of positioning holes 101 is greater than the number of insertion rods 231. In this way, when the tool holder 210 slides to multiple positions along the radial direction of the connecting shaft 110, there are corresponding positioning holes 101 for the insertion of the insertion rods 231.

[0032] Reference Figure 2 , Figure 4 and Figure 5 As shown, in some embodiments of the present invention, the locking portion 230 is provided with an abutment plate 232, a mounting rod 233 and an insertion rod 231. The abutment plate 232, the mounting rod 233 and the insertion rod 231 are an integrated structure. The mounting rod 233 is arranged at one end of the abutment plate 232 away from the positioning hole 101, that is, the mounting rod 233 is arranged on the upper surface of the abutment plate 232. The mounting rod 233 is vertically slidably penetrated in the knife seat 210 to slide the locking portion 230 on the knife seat 210. The elastic portion 240 is provided as a spring, and the spring is sleeved on the mounting rod 233, and the two ends of the spring are respectively abutted against the abutment plate 232. The connecting plate 232 and the knife seat 210 are used to apply a downward elastic force to the abutment plate 232. The insertion rod 231 is arranged at one end of the abutment plate 232 facing the positioning hole 101, that is, the insertion rod 231 is arranged on the lower surface of the abutment plate 232, wherein the insertion rod 231 is used to insert into the positioning hole 101; in some specific embodiments, a plurality of the insertion rods 231 are provided and are arranged at radial intervals along the connecting shaft 110, and a plurality of the mounting rods 233 are also provided and are arranged at radial intervals along the connecting shaft 110, and a spring is sleeved on any mounting rod 233, so as to improve the structural stability of the locking mechanism. In addition, the top end of the mounting rod 233 extends out of the knife seat 210 and is connected to the limiting nut 235. The limiting nut 235 is used to abut the knife seat 210 to ensure that the mounting rod 233 is always inserted into the knife seat 210. In this way, when the knife seat 210 is removed from the knife disc 100, the locking portion 230 will not be separated from the knife seat 210 under the action of the elastic portion 240.

[0033] Reference Figures 3 to 5As shown, in some embodiments of the present invention, a receiving groove 211 with an opening at the bottom end is provided at the bottom of the knife seat 210, the spring is located on the inner side of the receiving groove 211, and the abutment plate 232 is at least partially located on the inner side of the receiving groove 211, so as to avoid the spring being directly exposed to the outside, avoid the spring being directly affected by the impact of gravel or debris generated during hole expansion and being easily damaged, thereby improving the service life of the spring.

[0034] Reference Figures 2 to 5 As shown, in some embodiments of the present invention, the accommodating groove 211 penetrates the knife seat 210 along the radial direction of the connecting shaft 110, and the abutment plate 232 extends out of the accommodating groove 211 at both ends along the radial direction of the connecting shaft 110 and is provided with a lifting portion 234. The lifting portion 234 closes the open end of the accommodating groove 211 along the radial direction of the connecting shaft 110, so that the spring is located in a closed cavity, thereby preventing the spring from being stuck by gravel or debris generated during reverse hole expansion, and ensuring that the spring can be deformed normally when the position of the knife seat 210 is adjusted; in addition, the lifting portion 234 is configured as follows: by lifting the lifting portion 234, the abutment plate 232 can be driven to move vertically away from the positioning hole 101. In this way, when adjusting the position of the knife seat 210, a suitable force application position can be provided for the operator to make the insertion rod 231 disengage from the positioning hole 101, thereby improving the portability of the operation. In addition, lifting portions 234 are provided at both ends of the abutment plate 232, and the operator can lift the two lifting portions 234 with two hands respectively, so that the insertion rod 231 can be more smoothly separated from the positioning hole 101 with less resistance. Specifically, in this embodiment, the lifting portion 234 is an inverted L-shaped structure, so that the operator can apply force to lift the lifting portion 234.

[0035] Reference Figures 3 to 5 As shown, in some embodiments of the present invention, the tool holder 210 and the hob 220 are detachably connected, wherein a mounting position 212 with a top opening is provided on the top of the tool holder 210, and the hob 220 is located in the mounting position 212, and the tool holder 210 is provided with mounting parts on opposite sides of the axial direction of the hob 220, respectively, and the mounting parts on both sides abut against opposite sides of the axial direction of the hob 220 respectively to position the hob 220 along the axial direction of the hob 220, and the mounting parts on the opposite sides of the tool holder 210 are respectively rotatably matched with the hob 220, and the rotation axis coincides with the central axis of the hob 220, so that the hob 220 is rotatably installed on the tool holder 210, and in addition, the mounting parts on the opposite sides of the tool holder 210 can adjust the position along the axial direction of the hob 220 and separate the mounting parts from the hob 220, so that the two mounting parts can be separated from the hob 220 by adjusting the mounting parts along the axial direction of the hob 220, so that the hob 220 can be removed, which is convenient for maintenance and replacement of the hob 220 when it is damaged. In this embodiment, the hob 220 is distributed obliquely, and the central axis of the hob 220 and the central axis of the connecting shaft 110 are in the same vertical plane. The end of the hob 220 close to the connecting shaft 110 is its inclined top end, and the end away from the connecting shaft 110 is its inclined bottom end.

[0036] Reference Figures 3 to 5 As shown, in some embodiments of the present invention, bearings 250 are respectively installed at both ends of the axial direction of the hob 220, and the bearings 250 and the hob 220 are coaxially distributed. The mounting portion is provided with a mounting shaft 260, and the mounting shaft 260 can be arranged on the cutter seat 210 in an adjustable position along the axial direction of the hob 220. The mounting shaft 260 includes a first section 261 and a second section 262, and a step surface 263 is formed between the first section 261 and the second section 262. The inner ring of the bearing 250 is sleeved on the first section 261 and abuts against the step surface 263. By sleeved the inner ring of the bearing 250 on the first section 261, the hob 220 can rotate relative to the mounting shaft 260, and by making the inner ring of the bearing 250 abut against the step surface 263, the hob 220 is positioned along the axial direction of the hob 220. In this embodiment, the first section 261 and the second section 262 of the mounting shaft 260 are sequentially distributed in a direction away from the hob 220. In some specific embodiments, the second section 262 of the installation shaft 260 is provided with an external thread, and the cutter holder 210 is correspondingly provided with a threaded hole 213. The second section 262 of the installation shaft 260 is threadedly assembled in the threaded hole 213 on the cutter holder 210, so that the installation shaft 260 can be adjusted along the axial direction of the hob 220. Further, the second section 262 of the installation shaft 260 is provided with a knob 264 at one end away from the first section 261, and the knob 264 is used to abut against the outer surface of the cutter holder 210 away from the hob 220, so as to play a positioning role when screwing the installation shaft 260, and also provide a suitable force application position for the operator when screwing the installation shaft 260.

[0037] Reference Figures 3 to 5 As shown, in some embodiments of the present invention, the two ends of the hob 220 in the axial direction are respectively provided with mounting grooves 221, and the hob 220 is detachably provided with a sealing end cover 222 for closing the mounting groove 221 on the outer side of the mounting groove 221, the bearing 250 is assembled in the mounting groove 221, and the mounting shaft 260 is passed through the sealing end cover 222, so as to prevent the bearing 250 from being exposed to the outside and being impacted or corroded, thereby improving the service life of the bearing 250. It is conceivable that the sealing end cover 222 can be installed on the hob 220 by screws, and the inner end of the sealing end cover 222 abuts against the outer ring of the bearing 250.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0039] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A hole enlarging drill for a raise boring machine, characterized in that: include: A cutter disc, wherein a vertically extending connecting shaft is provided at the center of the upper surface of the cutter disc; A plurality of tool assemblies are arranged at intervals along the circumference of the connecting shaft, and the tool assembly includes a tool holder and a roller cutter. The tool holder is installed on the upper surface of the cutter disc and can be adjusted in position along the radial direction of the connecting shaft. The roller cutter is rotatably arranged on the tool holder.

2. The hole enlarging drill for a raise boring machine according to claim 1, characterized in that: A group of positioning holes is provided on the upper surface of the cutter disc corresponding to any of the cutter seats, and the group of positioning holes includes a plurality of positioning holes arranged radially along the connecting shaft. The cutter seat can be slidably arranged on the cutter disc radially along the connecting shaft, and a vertically adjustable locking mechanism is provided on the cutter seat. The locking mechanism can be at least partially inserted into the positioning holes to limit the radial sliding of the cutter seat along the connecting shaft, wherein when the cutter seat slides radially along the connecting shaft to a plurality of positions, there are corresponding positioning holes that cooperate with the locking mechanism.

3. The hole enlarging drill for a raise boring machine according to claim 2, characterized in that: The locking mechanism includes a locking part and an elastic part. The locking part is vertically slidably installed on the knife seat, the locking part is used to be inserted into the positioning hole, and the elastic part is used to apply a downward elastic force to the locking part so that the locking part can be inserted into the positioning hole.

4. The hole enlarging drill for a raise boring machine according to claim 3, characterized in that: The locking portion is provided with a plurality of insertion rods, which are arranged at intervals along the radial direction of the connecting shaft. The insertion rods are used to be inserted into the positioning holes. The spacing between any two adjacent positioning holes in the same group is equal to the spacing between any two adjacent insertion rods, and the number of the positioning holes is greater than the number of the insertion rods.

5. The hole enlarging drill for a raise boring machine according to claim 3, characterized in that: The locking portion is provided with an abutment plate, a mounting rod and an insertion rod. The mounting rod is provided at one end of the abutment plate away from the positioning hole. The mounting rod is vertically slidably penetrated through the knife seat. The elastic portion is provided as a spring. The spring is sleeved on the mounting rod, and the two ends of the spring respectively abut the abutment plate and the knife seat. The insertion rod is provided at one end of the abutment plate facing the positioning hole, and is used for being inserted into the positioning hole.

6. The hole enlarging drill for a raise boring machine according to claim 5, characterized in that: The bottom of the knife seat is provided with a receiving groove with an open bottom end, and the spring is located at the inner side of the receiving groove.

7. The hole enlarging drill for a raise boring machine according to claim 6, characterized in that: The accommodating groove penetrates the knife seat along the radial direction of the connecting shaft, and the abutment plate extends out of the accommodating groove at both ends along the radial direction of the connecting shaft and is provided with a lifting portion. The lifting portion closes the open end of the accommodating groove along the radial direction of the connecting shaft, and the abutment plate can be driven to move vertically away from the positioning hole by lifting the lifting portion.

8. The hole enlarging drill for a raise boring machine according to claim 1, characterized in that: The top of the cutter holder is provided with a mounting position with a top opening, and the hob is located in the mounting position. The cutter holder is provided with mounting parts on two opposite sides of the axial direction of the hob, respectively. The mounting parts on both sides abut against two opposite sides of the axial direction of the hob, and the mounting parts on both sides are respectively rotatably cooperated with the hob, wherein the mounting parts on both sides can adjust the position along the axial direction of the hob and separate the mounting parts from the hob.

9. The hole enlarging drill for a raise boring machine according to claim 8, characterized in that: Bearings are respectively installed at both ends of the axial direction of the hob, and the bearings are coaxially distributed with the hob. The mounting portion is provided with a mounting shaft, and the mounting shaft can be arranged on the cutter seat so as to adjust the position along the axial direction of the hob. The mounting shaft includes a first section and a second section, and a step surface is formed between the first section and the second section. The inner ring of the bearing is sleeved on the first section and abuts against the step surface.

10. The hole enlarging drill for a raise boring machine according to claim 9, characterized in that: The two ends of the hob cutter in the axial direction are respectively provided with mounting grooves, and sealing end covers for closing the mounting grooves are provided on the outer sides of the mounting grooves, the bearings are assembled in the mounting grooves, and the mounting shaft passes through the sealing end covers.

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