Controllable variable-diameter raise boring machine reamer bit

Abstract

In order to solve the technical problems, the invention provides the following technical scheme that the controllable diameter-variable raise boring machine reamer bit comprises a drill bit body, a plurality of telescopic rods are rotationally connected to the outer circumference of the drill bit body, and the telescopic rods are rotationally connected with the drill bit body; the extending end of each telescopic rod is rotationally connected with an edge cutter holder, the upper end of each edge cutter holder is fixedly connected with a connecting rod, the connecting rods are fixedly connected with rotating shafts, the positions, corresponding to the rotating shafts, of the upper ends of the edge cutter holders are fixedly connected with connecting notches, and the rotating shafts are rotationally and slidably connected into the corresponding connecting notches respectively. First clamping blocks are fixedly connected to the outer side faces of the edge cutter holders, first clamping grooves matched with the first clamping blocks are formed in the positions, corresponding to the first clamping blocks, of the drill bit body, second clamping blocks are fixedly connected to the lower end face of the connecting rod, and second clamping grooves matched with the second clamping blocks are formed in the positions, corresponding to the second clamping blocks, of the upper end of the drill bit body.

Description

Technical Field

[0001] The invention relates to the technical field of mine hole enlarging, in particular to a controllable variable diameter type raise boring machine hole enlarging drill bit. Background Art

[0002] The raise drilling process is to first install the raise drilling rig in the upper horizontal tunnel (or the ground), use a small diameter pilot drill bit (mostly a three-cone drill bit) to drill the pilot hole from top to bottom, and use clean water or mud as a circulating well washing fluid. After the pilot hole is drilled through, the pilot drill bit is removed in the lower horizontal tunnel, and the reaming drill bit is installed. Then the hole is expanded from bottom to top along the pilot hole. The broken drill cuttings fall freely from the working surface to the lower level by their own weight, and the slag is transported out of the lower horizontal tunnel by the loading and transportation equipment.

[0003] The reaming drill bit is a key component of the raise boring machine for large-volume rock crushing. The basic unit of rock crushing is the cutter, which is divided into side cutters, main cutters and center cutters according to their positions on the drill bit. The center cutter refers to the cutter closest to the center tube, the main cutter refers to all the cutters from the center cutter outward and the side cutters inward, and the side cutters are the rock-breaking cutters on the outermost side of the drill bit that form the bottom of the well and the edge of the well side, also known as the diameter-protecting cutters. The cutters are reasonably assembled and arranged on the drill bit, pressed into the rock under the action of pressure, and rotated under the driving force of the drill bit and the action of the cutter teeth and the rock, crushing the rock by scraping. When the cutter teeth are worn out or a drill jam occurs, the reaming drill bit needs to be lowered to the bottom tunnel for inspection or replacement of the cutter. However, in some construction processes, the shrinkage of the wellbore during reaming or the reduction in wellbore diameter caused by temporary support of the wellbore may lead to the problem that the reaming drill bit cannot be lowered normally. At the same time, conventional reaming drill bits are installed manually in the tunnel by extending a rotating rod into the tunnel below the reaming hole, which is not only time-consuming and labor-intensive but also relatively dangerous.

[0004] Therefore, a reaming drill bit is needed that can be adjusted according to the diameter change of the well wall, and can be directly extended downward to the bottom of the reaming hole after being installed on the ground and then unfolded, so that the diameter can be reduced and then passed through the part that does not need reaming, and it can be quickly unfolded and continue to work after passing. At the same time, since the structure of the drill bit needs to be in a movable connection mode, the movable connection part is prone to deformation and breakage. At the same time, since the drill bit will be subjected to downward pressure and lateral force during the reaming process, it needs to be stabilized according to the diameter change method and structure. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to provide a reaming drill bit that can change its diameter, and at the same time, to provide a controllable variable diameter type raise boring machine reaming drill bit that can stably position the connection part of the variable diameter.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A controllable variable diameter reverse drilling rig reaming drill bit comprises a drill body, a plurality of telescopic rods are rotatably connected to the lower end of the outer circumference of the drill body, and the extended ends of each telescopic rod extend obliquely upward, and the extended ends of each telescopic rod are rotatably connected to a side cutter seat, and the upper end of the side cutter seat is fixedly connected to a connecting rod stacked on the drill body, and the connecting rod is fixedly connected to a rotating shaft toward the axial direction of the drill body, and the upper end of the side cutter seat is fixedly connected to a connecting groove corresponding to the position of the rotating shaft on each connecting rod, and the rotating shafts are respectively rotatably and slidably connected in the corresponding connecting grooves, and the outer side surface of the side cutter seat is fixedly connected to a first clamping block corresponding to the outer circumference of the drill body, and a first clamping groove matching the first clamping block is respectively opened at the outer circumference of the drill body and the position of the first clamping block, and a second clamping block is fixedly connected to the lower end surface of the connecting rod at the position corresponding to the upper end of the drill body, and a second clamping groove matching the second clamping block is respectively opened at the upper end of the drill body and the second clamping block.

[0008] Preferably, a reinforcement block is fixedly connected to the outer side of the first clamping block on the edge cutter holder, and reinforcement grooves are respectively provided on the outer side surface of the drill bit body corresponding to the position of the reinforcement block. Positioning blocks are rotatably connected to the upper and lower ends of the reinforcement grooves. One end of the positioning block extends out of the drill bit body and is fixedly connected to an eccentric block for pressing the reinforcement block. When the eccentric block is rotated to a position corresponding to the position of the reinforcement block, the reinforcement block is pressed and positioned. The other end of the positioning block extends into the inner side of the drill bit body and is fixedly connected to a driving plate with a driving groove. A lifting member is vertically slidably connected to the inner side of the drill bit body corresponding to the position of the edge cutter holder. A lifting member is fixedly connected to the lifting member with a lifting drive column, which is rotatably and slidably connected to the driving groove on the corresponding driving plate. The lifting member is driven by the lifting rod and performs lifting and lowering movements.

[0009] Preferably, the cross-section of the first slot is a right-angled trapezoid, wherein the right-angled trapezoid opens outward and the right-angled side is located at the lower end, the first card block and the reinforcement block correspond to the first slot respectively, and a gap is left between the outer side of the reinforcement block and the reinforcement slot.

[0010] Preferably, the reinforcement blocks are respectively located on the outside of the first clamping block, and positioning blocks are rotatably connected to the upper and lower ends of each reinforcement block. The eccentric blocks on the outside of the positioning blocks limit the reinforcement blocks when they are rotated to the corresponding positions of the reinforcement blocks. When the positioning blocks are reset, the reinforcement blocks lose the limit used for reinforcement.

[0011] Preferably, the cross section of the second slot is an inverted trapezoidal structure, and the angle between the outer side surface of the second slot away from the drill body rotation axis and the lower end surface is smaller than the angle between the inner side surface of the second slot close to the drill body rotation axis and the lower end surface.

[0012] Preferably, the edge cutter holder comprises a right-angled seat body, the right-angled side of the right-angled seat body is divided into an outer tool holder extending outward and arranged horizontally and an inner tool holder arranged vertically and attached to the outer circumference of the drill bit body and arranged vertically, and a drill bit is connected to the outer side of the upper end face of the outer tool holder.

[0013] Preferably, the front and rear ends of the right-angled seat of the edge knife holder are respectively provided with reinforcement plates, the telescopic rod is located in the gap between the two reinforcement plates, and a groove is provided on the inner knife holder at a position corresponding to the position of the telescopic rod to prevent the telescopic rod from being blocked from moving.

[0014] Preferably, the drill bit body includes a hollow rotating rod, the outer circumference of the rotating rod is detachably connected to a cutter disc, vertical planes are respectively provided at the positions corresponding to the outer circumference of the cutter disc and the position of the telescopic rod, the side surface of the edge cutter seat is in contact with the vertical plane, a connecting port is provided at the lower end of the rotating rod, and connecting ports for controlling the telescopic extension are respectively provided at both ends of the telescopic rod.

[0015] Preferably, a closing disk is coaxially rotatably connected to the upper end of the drill body, the closing disk and the upper end of the drill body are connected via a small telescopic rod, and a plurality of closing plates corresponding to the second slots are fixedly connected to the outer circumference of the closing disk.

[0016] Preferably, the closing pieces are arc-shaped pieces and their number corresponds to the second slots, each closing piece is located on the corresponding side of the second slot and extends toward the second slot, and the extending direction of each closing piece is opposite to the rotation direction of the drill body.

[0017] The technical solution of the present invention achieves the following beneficial technical effects:

[0018] 1. Use a telescopic rod to control the unfolding and storage of the edge knife holder. The telescopic rod is controlled by a pneumatic telescopic rod or a hydraulic rod to provide stable power for the flipping of the edge knife holder;

[0019] 2. When the drill bit needs to shrink and change its diameter, air or hydraulic oil is supplied to the lower end of the telescopic rod to extend the telescopic rod. The side cutter seat at the upper end of the telescopic rod rotates along the rotating connection part with the upper end of the drill body under the action of the telescopic rod. After the side cutter seat rotates, it is folded at the upper end of the drill body to complete the diameter reduction. When the hole needs to be expanded, air or hydraulic oil is supplied to the upper end of the telescopic rod to retract the telescopic rod, and the side cutter seat is reset under the retraction of the rope rod;

[0020] 3. The edge cutter seat is divided into an outer cutter disc and an inner cutter disc and arranged at 90 degrees. Trapezoidal blocks are fixed on the sides of the outer cutter disc and the inner cutter disc that contact the drill body, and a slot corresponding to the block is opened on the drill body;

[0021] 4. The side cutter holder supports the downward force generated during the hole expansion process through the clamping block and the clamping slot, and the drill body is also provided with a reinforcement and structure to support the steering force generated by the side cutter holder. A reinforcement block extending outward is fixedly connected to the side of the side cutter holder, and a slot for accommodating the reinforcement block is opened on the drill body. Clamping parts for clamping the reinforcement block and limiting its detachment are rotatably connected to the upper and lower ends of the slot. The reaction force generated when the side cutter holder rotates is offset by positioning the reinforcement block on the side cutter holder, thereby avoiding damage to the rotating shaft on the side cutter holder. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0024] Figure 3 It is a partial cross-sectional view of the overall structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the development process of the present invention;

[0026] Figure 5 It is a cross-sectional view of the development process of the present invention;

[0027] Figure 6 This is a structural diagram of the present invention in a reduced diameter state;

[0028] Figure 7 It is a cross-sectional view of the present invention in a reduced diameter state;

[0029] Figure 8 This is a structural diagram of the positioning block of the present invention;

[0030] Fig. 9 This is the driving principle diagram of the positioning block of the present invention;

[0031] Fig.10 This is a structural diagram of the edge knife holder of the present invention;

[0032] Fig.11 This is the second viewing angle of the structure diagram of the edge knife holder of the present invention;

[0033] Fig.12 It is a structural diagram of the closed disk of the present invention.

[0034] The reference numerals in the figure are as follows: 1. drill body; 2. telescopic rod; 3. edge cutter seat; 4. connecting rod; 5. connecting slot; 6. first clamping block; 7. first clamping slot; 8. second clamping block; 9. second clamping slot; 10. reinforcement block; 11. reinforcement slot; 12. positioning block; 13. drive plate; 14. lifting member; 15. lifting drive column; 16. reinforcement plate; 17. hollow rotating rod; 18. cutter disc; 19. closing disc; 20. small telescopic rod; 21. closing piece. DETAILED DESCRIPTION

[0035] This embodiment is described in detail with reference to the accompanying drawings.

[0036] When the present embodiment is in use, the main body of the drill body 1 includes a cylindrical rotating rod, which is a hollow rod, and a cutter disc 18 is detachably connected to the rotating rod. The cutter disc 18 is a hollow cylindrical shape, and the hollow part cooperates with the rotating rod. There is a hollow structure between the outer contour of the cutter disc 18 and the hollow part in the middle. A plurality of reinforcing ribs uniformly distributed along the circumference of the axis of the cutter disc 18 are fixedly connected to the hollow structure part on the inner side of the cutter disc 18. A plurality of vertical planes are uniformly distributed on the outer circumference of the cutter disc 18, and the lower end of each plane is rotatably connected to a rotating seat, and a telescopic rod 2 is rotatably connected to the rotating seat, and the upper end of the telescopic rod 2 is rotatably connected to a side knife seat 3. The side knife seat 3 is fixedly connected with a drill bit for expanding the diameter, and the upper end of the side cutter holder 3 is rotatably connected to the upper end of the cutter disc 18. The side cutter holder 3 is controlled to perform diameter reduction and expansion movements by the extension and retraction of the telescopic rod 2. Whether the telescopic rod 2 adopts a hydraulic telescopic rod 2 or a pneumatic telescopic rod 2 is determined according to actual conditions. A connecting port is provided at the lower end of the rotating rod. Compressed gas or hydraulic oil is injected into the rotating rod from the upper end according to whether pneumatic or hydraulic drive is adopted. The connecting port at the lower end of the rotating rod is an outlet. The outlet of the connecting port is connected to the upper and lower ends of the telescopic rod 2 through a hose and a control valve, respectively, so as to control the extension and retraction of the telescopic rod 2 when pressure injection is performed.

[0037] The edge knife seat 3 includes a right-angled seat body arranged at 90 degrees, the right-angled seat body extends toward the axis of the rotating rod, and each right-angled seat body is evenly distributed along the circumference of the axis of the rotating rod. The right-angled sides of the right-angled seat are respectively an outer tool holder arranged horizontally and facing outward and an inner tool holder arranged vertically and extending toward the lower side. A drill bit is fixedly connected to the outer side of the upper end face of the outer tool holder, and a connecting rod 4 extending toward the inside is fixedly connected to the upper end of the outer tool holder. A plurality of connecting notches 5 are evenly distributed on the outer circumference of the upper end face of the cutter disc 18, and the connecting notches 5 are horizontal. A straight slot is arranged, and the protruding end of the connecting rod 4 is fixedly connected with a rotating shaft arranged perpendicular to the axis of the rotating rod. The rotating shaft is rotatably and slidably connected in the connecting slot 5. A reinforcing plate 16 is provided at the angle of the right-angled seat body. There are two reinforcing plates 16 and they are respectively located on both sides of the right-angled base. The telescopic rod 2 is located in the space between the two reinforcing plates 16. At the same time, the upper end of the telescopic rod 2 is rotatably connected to the reinforcing plate 16. A slot is provided at the lower end of the inner tool holder to avoid blocking the extension of the telescopic rod 2, so that there will be no obstruction when the edge knife seat 3 rotates as a whole.

[0038] A first clamping block 6 of a trapezoidal structure is fixedly connected to the side surface where the inner knife seat contacts the knife disc 18. The cross section of the first clamping block 6 is a right-angled trapezoidal structure. The right-angled side of the right-angled trapezoid is located at the lower end and the upper end is obliquely extended downward. First clamping grooves 7 that match the first clamping block 6 and have corresponding shapes are respectively provided at the positions corresponding to the positions of the outer circumference of the knife disc 18 and the first clamping block 6, so that when the edge knife seat 3 is subjected to downward force, it can be clamped in the first clamping groove 7 through the right-angled side on the first clamping block 6. A second clamping block 8 that extends downward is fixedly connected to the matching position between the lower end surface of the connecting rod 4 and the upper end surface of the knife disc 18. The cross section of the second clamping block 8 is a trapezoid, and the inner and outer sides of the second clamping block 8 are both oblique sides. The second clamping groove 9 is away from The angle between the outer side surface of the rotating rod and the lower end surface is smaller than the angle between the inner side surface of the second slot 9 close to the rotating rod and the lower end surface. Through the clamping action of the second clamping block 8 and the second slot 9, the connecting rod 4 is overlapped on the guide seat, and the trapezoidal structure can prevent the side knife seat 3 from being displaced when subjected to outward force. The reason why the second slot 9 does not adopt a right-angled trapezoid is that if a right-angled trapezoid is adopted, the contact part between the outer side of the guide seat and the inner knife seat is parallel, so the side knife seat 3 can only be rotated after being translated upward for a certain distance, otherwise direct rotation will cause interference. Therefore, the second slot 9 cannot adopt a right-angled trapezoid. In order to improve the stability of the overlap, the angles on both sides of the trapezoidal structure are different.

[0039] Since a variable diameter structure is adopted, and since it is necessary to rotate and move upward at the same time during the hole expansion process, the forces that the side knife holder 3 needs to bear are mainly divided into three directions, namely downward pressure, pressure in the direction away from the axis of the rotating rod, and lateral force generated during rotation, wherein the downward and outward pressures are both supported by the first block 6 and the second block 8, and the lateral force generated during rotation is borne only by the rotating connection part in the variable diameter structure, which not only easily damages the connecting shaft of the rotating connection part, but also because the rotating part is a movable connection, the force that can be borne is small, and in the case of slight deformation, it will affect the rotation fit, so it is necessary to apply additional positioning force to the side knife holder 3 to maintain the stability of rotation.

[0040] Reinforcement blocks 10 are fixedly connected to both sides of the inner knife seat in the edge knife seat 3, and reinforcement slots 11 are respectively opened at the positions corresponding to the positions of the reinforcement blocks 10 on the outer side of the guide seat. The reinforcement slots 11 correspond to the reinforcement blocks 10, and the size of the reinforcement slots 11 must match the reinforcement blocks 10 and leave a certain gap. When the reinforcement blocks 10 are normally located in the reinforcement slots 11, the outer plane of the reinforcement blocks 10 is in the same plane as the outer side of the knife disc 18. Reinforcement blocks 10 are rotatably connected at the upper and lower ends of each reinforcement slot 11 for pressing the reinforcement blocks 10. The positioning block 12 for pressure positioning is a cam block. When the cam block rotates, it controls the protruding end of the cam block to rotate to the position of pressing the positioning block 12. At the same time, when the cam block reverses and resets, it releases the pressure on the positioning block 12, thereby positioning the side knife seat 3 by pressing and positioning each positioning block 12. Since the pressing blocks are respectively located on both sides of the side knife seat 3, the pressing blocks are pressed and positioned to offset the lateral force generated by the side knife seat 3 during the hole expansion rotation, thereby protecting the rotating shaft of the rotational connection between the two ends of the side knife seat 3 and the cutter disc 18.

[0041] The end of the positioning block 12 extending toward the inner side of the cutter disc 18 is fixedly connected to a driving plate 13, and a driving groove is opened on the driving plate 13. A lifting member 14 is vertically slidably connected to the inner side of the cutter disc 18 and is driven to lift and lower through a lifting rod. A plurality of lifting driving columns 15 are fixedly connected to the lifting member 14, and each lifting driving column 15 is respectively rotated and slidably connected in a corresponding driving groove. The lifting and lowering movement of the lifting member 14 is used to rotate and slide the lifting driving columns 15 on each positioning block 12 in the corresponding driving groove, thereby driving the positioning block 12 to rotate.

[0042] The upper end surface of the knife disc 18 is coaxially connected with an annular closing disc 19, and the outer circumference of the closing disc 19 is fixedly connected with a plurality of closing pieces 21, each of which corresponds to the position of the second slot 9, so that when the closing disc 19 rotates, the closing piece 21 closes the upper end of each second slot 9, and the closing piece 21 is connected to the upper end surface of the knife disc 18 by a small telescopic rod 20, so that when the small telescopic rod 20 is extended, the closing disc 19 is driven to rotate, so that each closing piece 21 closes the upper end of the second slot 9, and when the small telescopic rod 20 is reset, the upper end of the second slot 9 is opened, which can avoid the problem of falling residues due to the upward opening of the second slot 9 during the diameter change process. Furthermore, an exhaust port is provided on the closing piece 21 corresponding to the position of the second slot 9, and the exhaust port is used to blow into the second slot 9, so that the residue accidentally dropped into the second slot 9 is blown out by the wind, thereby avoiding the second card block 8 from being stuck in the process of entering the second slot 9.

[0043] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A controllable variable diameter raise boring machine reaming drill bit, characterized in that: The drill bit body (1) comprises a plurality of telescopic rods (2) rotatably connected to the lower end of the outer circumference of the drill bit body (1), the extended end of each telescopic rod (2) extends obliquely upward, the extended end of each telescopic rod (2) is rotatably connected to a side cutter seat (3), the upper end of the side cutter seat (3) is fixedly connected to a connecting rod (4) stacked on the drill bit body (1), the connecting rod (4) is fixedly connected to a rotating shaft in the direction of the axis of the drill bit body (1), the upper end of the side cutter seat (3) is fixedly connected to a connecting notch (5) corresponding to the position of the rotating shaft on each connecting rod (4), and the rotating shaft is respectively rotatably connected to the side cutter seat (3) ... The connecting rod (4) is movably and slidably connected in the corresponding connecting notch (5); a first clamping block (6) is fixedly connected at the outer side surface of the edge cutter seat (3) and the position corresponding to the outer circumference of the drill body (1); a first clamping groove (7) matching with the first clamping block (6) is respectively opened at the outer circumference of the drill body (1) and the position corresponding to the first clamping block (6); a second clamping block (8) is fixedly connected at the lower end surface of the connecting rod (4) and the position corresponding to the upper end of the drill body (1); a second clamping groove (9) matching with the second clamping block (8) is respectively opened at the upper end of the drill body (1) and the position corresponding to the second clamping block (8).

2. The controllable variable diameter raise boring machine reaming drill bit according to claim 1, characterized in that: A reinforcement block (10) is fixedly connected to the outside of the first clamping block (6) on the edge cutter seat (3); reinforcement slots (11) are respectively provided on the outer side surface of the drill bit body (1) at positions corresponding to the positions of the reinforcement blocks (10); positioning blocks (12) are rotatably connected to the upper and lower ends of the reinforcement slots (11); one end of the positioning block (12) extends out of the drill bit body (1) and is fixedly connected to an eccentric block for pressing the reinforcement block (10); when the eccentric block is rotated to a position corresponding to the position of the reinforcement block (10), the eccentric block presses the reinforcement block (10) ) is pressed and positioned, the other end of the positioning block (12) extends into the inner side of the drill bit body (1) and is fixedly connected to a driving plate (13) with a driving groove, a lifting member (14) is vertically slidably connected to the inner side of the drill bit body (1) corresponding to the position of the edge cutter seat (3), a lifting drive column (15) is fixedly connected to the lifting member (14), the lifting drive column (15) is rotated and slidably connected to the corresponding driving groove on the driving plate (13), and the lifting member (14) is driven by the lifting rod to perform lifting movement.

3. The controllable variable diameter raise boring machine reaming drill bit according to claim 2, characterized in that: The cross section of the first clamping slot (7) is a right-angled trapezoid, wherein the right-angled trapezoid opens outward and the right-angled side is located at the lower end; the first clamping block (6) and the reinforcement block (10) respectively correspond to the first clamping slot (7); and a gap is left between the outer side of the reinforcement block (10) and the reinforcement notch (11).

4. The controllable variable diameter raise boring machine reaming drill bit according to claim 2, characterized in that: The reinforcement blocks (10) are respectively located outside the first clamping block (6); positioning blocks (12) are rotatably connected at the upper and lower ends of each reinforcement block (10); the eccentric blocks outside the positioning blocks (12) limit the reinforcement blocks (10) when they are rotated to the corresponding positions of the reinforcement blocks (10); when the positioning blocks (12) are reset, the reinforcement blocks (10) lose the limit function for reinforcement.

5. The controllable variable diameter raise boring machine reaming drill bit according to claim 2, characterized in that: The cross section of the second clamping groove (9) is an inverted trapezoidal structure, and the angle between the outer side surface of the second clamping groove (9) away from the rotating shaft of the drill body (1) and the lower end surface is smaller than the angle between the inner side surface of the second clamping groove (9) close to the rotating shaft of the drill body (1) and the lower end surface.

6. The controllable variable diameter raise boring machine reaming drill bit according to claim 5, characterized in that: The edge cutter seat (3) comprises a right-angle seat body, wherein the right-angle side of the right-angle seat body is divided into an outer tool holder extending outward and arranged horizontally, and an inner tool holder arranged vertically and fitted on the outer circumference of the drill body (1) and arranged vertically, and a drill is connected to the outer side of the upper end surface of the outer tool holder.

7. The controllable variable diameter raise boring machine reaming drill bit according to claim 6, characterized in that: The right-angled seat body of the edge knife seat (3) is provided with reinforcing plates (16) at the front and rear ends respectively, the telescopic rod (2) is located in the gap between the two reinforcing plates (16), and a notch is provided on the inner knife holder at a position corresponding to the position of the telescopic rod (2) to prevent the telescopic rod (2) from being blocked from moving.

8. The controllable variable diameter raise boring machine reaming drill bit according to claim 1, characterized in that: The drill bit body (1) comprises a hollow rotating rod (17), the outer circumference of which is detachably connected to a cutter disc (18), the outer circumference of which is corresponding to the position of the telescopic rod (2) is provided with vertical planes, the side of the edge cutter seat (3) is fitted with the vertical plane, the lower end of the rotating rod is provided with a connecting port, and the two ends of the telescopic rod (2) are provided with connecting ports for controlling telescopic movement.

9. The controllable variable diameter raise boring machine reaming drill bit according to claim 1, characterized in that: The upper end of the drill body (1) is coaxially rotatably connected to a closing disk (19), the closing disk (19) and the upper end of the drill body (1) are connected via a small telescopic rod (20), and the outer circumference of the closing disk (19) is fixedly connected to a plurality of closing plates (21) corresponding to the second clamping grooves (9).

10. The controllable variable diameter raise boring machine reaming drill bit according to claim 9, characterized in that: The closing pieces (21) are arc-shaped pieces and their number corresponds to the second slots (9). Each closing piece (21) is located on the side of the corresponding second slot (9) and extends toward the second slot (9). The extending direction of each closing piece (21) is opposite to the rotation direction of the drill bit body (1).

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